Corner cases not handled correctly by normalizePath

[wrr]

I found following two corner cases that do not seem to be handled correctly by normalizePath():

>URI('/.//').normalizePath().toString()
'//'

>URI('/foo/..').normalizePath().toString()
'/foo/..'

I can try to write a fix, if you agree that these two should both produce /

[wrr]

And one more:

>URI('/.').normalizePath().toString()
'/.'

[rodneyrehm]

true. Maybe @djcsdy has some htoughts on that, he already fixed a couple of edge cases (see open pull requests)

[rodneyrehm]

I've fixed this in master - it will be included in the next release. thank you for your help!