Updated the README
Renamed Rakefile
Added Travis CI setup
Test cleanup

Removed lots of unused variables are the test suite complained:

  'warning: assigned but unused variable - cal'

all over the place.

There are still indentation issues with many of tests. But I figured
better to deal with the previous pull request first, then this one
before continuing.
Merge pull request #2 from dotemacs/small-updates

Small updates
Merge pull request #3 from dotemacs/test-tweaks

Test cleanup