Refactored definition of supported languages

[lta14]

This change is 

[7enderhead]

antiweb_lib/readers/config.py, line 20 at r1 (raw file):

#@start(supported_languages doc)

#The following list contains all supported languages:

explain the data structure

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Comments from Reviewable

[7enderhead]

antiweb_lib/readers/config.py, line 57 at r1 (raw file):

1) Go to `Available Lexers <http://pygments.org/docs/lexers/>` _ for more information about all available pygments lexers.
2) Implement a new reader class if language specific text processing is needed.
3) Add a new entry for the Language in supported_languages.

an example would be helpful

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