draft of an fontello executable

this allows to extract the fonts and css from the zip file when not in
a rails application.
also this adds the functionality to edit a certain config with the
fontello API.

commands are:
* fontello open to open the fontello website with a certain conifg.json
* fontello convert to convert a downloaded zip file
rename fontello-converter to fontello
Merge remote-tracking branch 'bumi/master'

Conflicts:
	fontello_rails_converter.gemspec
installed rspec and pry
moved API communication to own class
basic specs
more API
removed whitespace