Add .ruby-version and .ruby-gemset files.
Split version information out into its own file.

So we can require it separately.
Use bundler and stop using jeweler.
Set up Travis CI.
Set up Coveralls integration.
Merge branch 'next'

* next:
  Set up Coveralls integration.
  Set up Travis CI.
  Use bundler and stop using jeweler.
  Split version information out into its own file.
  Add .ruby-version and .ruby-gemset files.