Replaced .rvmrc by .ruby-version.
Travis ci: removed ruby 1.8.7 and 1.9.2, added 2.0.0.
Updated all gems.
Added badges to readme. Updated license. Version constant.
Added rake-version for version management.
Removed unwanted files from gemspec.
Removed versions of dev dependencies. Removed documentation gem.
Version bump to 1.0.1.