Renamed term_24bit_colors to term_truecolor
Made some functions from powerline be more convenient for use in lint checker
Made it proceed in case of trailing comma errors
Moved add_local_theme and get_theme to vim renderer

In any case for all other extensions they are useless. (Except for ipython, but 
it is TODO and I am not going to use matchers this way, simple dictionary 
lookup is better in this case.)
Removed unused “colors” key
Added main configuration checks

Ref #278