Minor grammar updates for README.md
Merge pull request #29 from pbevin/patch-1

Minor punctuation fixes for README.md
Remove erroneous comma from example setting
Merge pull request #30 from sobering/master

Remove erroneous comma from example setting
Remove .rb from Rake task require.

The .rb isn't necessary and will be automatically appended by Ruby.
Merge pull request #32 from benmanns/patch-1

Remove .rb from Rake task require.