change authorization of grit.rb
add Gemfile
Merge pull request #3 from acharpen/feature-chmod+x

change authorization of grit.rb
Merge pull request #4 from acharpen/feature-required-gems

add gem files.
added diff stats addon.
introduced joins and modified clear semantics.
fixed load_addons.
updated README.
removed require pry
now diffsize counts by sources.
now join can be applied with --clear. removed unjoin.
improved logging of process command.
now joins are applyed/cleaned from join subcommand
separated status et source info commands.
removed process command. introduced perform subcommands.
improved doc for perform commands.
tabified.
implented clean subcommands.
resolved bugs from clean analyses code.
huge infrastructure refactoring.