Remove unneeded verbiage from README
Removed redundant 'Contact' information from README

There is no need to provide a GitHub link in a page which is hosted
on GH. Anyone who sees the README already knows the GH page for the project, because they are on it! The RubyGems link is not much
more useful.
Merge pull request #112 from alexdowad/terse_readme

Make README more concise