Add documentation.

[ghost]

Add auto-generated documentation. Note that 95.96 % is undocumented.

Suggestion on documenting each module in lib or other *.rb

here we say what does this *.rb does

task:

Author: author_name

Date: data

Copyright: copyright

I'll manage to develop a website for both betty and its documentation in either in jekyll(this way we can run it on Github server) or in Sinatra(this way i push it on betty.herokuapp.com). What do you think?

[ghost]

This is incorrect pull request(it's not through dev branch). See another related pull request.

[pickhardt]

Not dev.