[SPARK-5867] [SPARK-5892] [doc] [ml] [mllib] Doc cleanups for 1.3 release

For SPARK-5867:
* The spark.ml programming guide needs to be updated to use the new SQL DataFrame API instead of the old SchemaRDD API.
* It should also include Python examples now.

For SPARK-5892:
* Fix Python docs
* Various other cleanups

BTW, I accidentally merged this with master.  If you want to compile it on your own, use this branch which is based on spark/branch-1.3 and cherry-picks the commits from this PR: [https://github.com/jkbradley/spark/tree/doc-review-1.3-check]

CC: mengxr  (ML),  davies  (Python docs)

Author: Joseph K. Bradley <[email protected]>

Closes #4675 from jkbradley/doc-review-1.3 and squashes the following commits:

f191bb0 [Joseph K. Bradley] small cleanups
e786efa [Joseph K. Bradley] small doc corrections
6b1ab4a [Joseph K. Bradley] fixed python lint test
946affa [Joseph K. Bradley] Added sample data for ml.MovieLensALS example.  Changed spark.ml Java examples to use DataFrames API instead of sql()
da81558 [Joseph K. Bradley] Merge remote-tracking branch 'upstream/master' into doc-review-1.3
629dbf5 [Joseph K. Bradley] Updated based on code review: * made new page for old migration guides * small fixes * moved inherit_doc in python
b9df7c4 [Joseph K. Bradley] Small cleanups: toDF to toDF(), adding s for string interpolation
34b067f [Joseph K. Bradley] small doc correction
da16aef [Joseph K. Bradley] Fixed python mllib docs
8cce91c [Joseph K. Bradley] GMM: removed old imports, added some doc
695f3f6 [Joseph K. Bradley] partly done trying to fix inherit_doc for class hierarchies in python docs
a72c018 [Joseph K. Bradley] made ChiSqTestResult appear in python docs
b05a80d [Joseph K. Bradley] organize imports. doc cleanups
e572827 [Joseph K. Bradley] updated programming guide for ml and mllib

Author: jkbradley

data/mllib/als/sample_movielens_movies.txt

@@ -0,0 +1,100 @@
+0::Movie 0::Romance|Comedy
+1::Movie 1::Action|Anime
+2::Movie 2::Romance|Thriller
+3::Movie 3::Action|Romance
+4::Movie 4::Anime|Comedy
+5::Movie 5::Action|Action
+6::Movie 6::Action|Comedy
+7::Movie 7::Anime|Comedy
+8::Movie 8::Comedy|Action
+9::Movie 9::Anime|Thriller
+10::Movie 10::Action|Anime
+11::Movie 11::Action|Anime
+12::Movie 12::Anime|Comedy
+13::Movie 13::Thriller|Action
+14::Movie 14::Anime|Comedy
+15::Movie 15::Comedy|Thriller
+16::Movie 16::Anime|Romance
+17::Movie 17::Thriller|Action
+18::Movie 18::Action|Comedy
+19::Movie 19::Anime|Romance
+20::Movie 20::Action|Anime
+21::Movie 21::Romance|Thriller
+22::Movie 22::Romance|Romance
+23::Movie 23::Comedy|Comedy
+24::Movie 24::Anime|Action
+25::Movie 25::Comedy|Comedy
+26::Movie 26::Anime|Romance
+27::Movie 27::Anime|Anime
+28::Movie 28::Thriller|Anime
+29::Movie 29::Anime|Romance
+30::Movie 30::Thriller|Romance
+31::Movie 31::Thriller|Romance
+32::Movie 32::Comedy|Anime
+33::Movie 33::Comedy|Comedy
+34::Movie 34::Anime|Anime
+35::Movie 35::Action|Thriller
+36::Movie 36::Anime|Romance
+37::Movie 37::Romance|Anime
+38::Movie 38::Thriller|Romance
+39::Movie 39::Romance|Comedy
+40::Movie 40::Action|Anime
+41::Movie 41::Comedy|Thriller
+42::Movie 42::Comedy|Action
+43::Movie 43::Thriller|Anime
+44::Movie 44::Anime|Action
+45::Movie 45::Comedy|Romance
+46::Movie 46::Comedy|Action
+47::Movie 47::Romance|Comedy
+48::Movie 48::Action|Comedy
+49::Movie 49::Romance|Romance
+50::Movie 50::Comedy|Romance
+51::Movie 51::Action|Action
+52::Movie 52::Thriller|Action
+53::Movie 53::Action|Action
+54::Movie 54::Romance|Thriller
+55::Movie 55::Anime|Romance
+56::Movie 56::Comedy|Action
+57::Movie 57::Action|Anime
+58::Movie 58::Thriller|Romance
+59::Movie 59::Thriller|Comedy
+60::Movie 60::Anime|Comedy
+61::Movie 61::Comedy|Action
+62::Movie 62::Comedy|Romance
+63::Movie 63::Romance|Thriller
+64::Movie 64::Romance|Action
+65::Movie 65::Anime|Romance
+66::Movie 66::Comedy|Action
+67::Movie 67::Thriller|Anime
+68::Movie 68::Thriller|Romance
+69::Movie 69::Action|Comedy
+70::Movie 70::Thriller|Thriller
+71::Movie 71::Action|Comedy
+72::Movie 72::Thriller|Romance
+73::Movie 73::Comedy|Action
+74::Movie 74::Action|Action
+75::Movie 75::Action|Action
+76::Movie 76::Comedy|Comedy
+77::Movie 77::Comedy|Comedy
+78::Movie 78::Comedy|Comedy
+79::Movie 79::Thriller|Thriller
+80::Movie 80::Comedy|Anime
+81::Movie 81::Comedy|Anime
+82::Movie 82::Romance|Anime
+83::Movie 83::Comedy|Thriller
+84::Movie 84::Anime|Action
+85::Movie 85::Thriller|Anime
+86::Movie 86::Romance|Anime
+87::Movie 87::Thriller|Thriller
+88::Movie 88::Romance|Thriller
+89::Movie 89::Action|Anime
+90::Movie 90::Anime|Romance
+91::Movie 91::Anime|Thriller
+92::Movie 92::Action|Comedy
+93::Movie 93::Romance|Thriller
+94::Movie 94::Thriller|Comedy
+95::Movie 95::Action|Action
+96::Movie 96::Thriller|Romance
+97::Movie 97::Thriller|Thriller
+98::Movie 98::Thriller|Comedy
+99::Movie 99::Thriller|Romance