Added territory-language import from CLDR.

[mxsasha]

Available in the global data onder the 'territory_language' key. For example, for NL this looks like:

{'en': {'official_status': None, 'population_percent': 74.0},
 'fy': {'official_status': 'official_regional', 'population_percent': 4.3},
 'gos': {'official_status': None, 'population_percent': 3.6},
 'id': {'official_status': None, 'population_percent': 1.8},
 'li': {'official_status': None, 'population_percent': 5.5},
 'nl': {'official_status': 'official', 'population_percent': 100.0},
 'rif': {'official_status': None, 'population_percent': 1.2},
 'tr': {'official_status': None, 'population_percent': 1.2},
 'zea': {'official_status': None, 'population_percent': 1.4}
}

Source from the CLDR is: http://www.unicode.org/cldr/charts/latest/supplemental/territory_language_information.html

[sils]

looks good on first sight. Rebase to make tests pass and then we'll see the coverage.

[codecov-io]

Current coverage is 83.38%

Merging #122 into master will not affect coverage as of 129076b

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Review entire Coverage Diff as of 129076b

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[sils]

assigning @etanol for review of CLDR related PR :)

[etanol]

Wouldn't this need some kind of API functionality? I am not sure if the global.dat file is intended to be directly exposed, because its structure is not guaranteed to be stable. Any future changes to it would then break users' code.

[akx]

Well, get_global() is a public API as it is...

[akx]

This was closed via #315.