Add a note to the README about how to run the tests.
Fix typo in comment.
Drop double `const`.
Drop trailing whitespace.
Merge pull request #9 from b4hand/readme-tests

Add a note to the README about how to run the tests.
Merge pull request #12 from b4hand/fix-typo

Fix typo in comment.
Merge pull request #13 from b4hand/drop-double-const

Drop double `const`.
Merge pull request #14 from b4hand/drop-trailing-whitespace

Drop trailing whitespace.
Add Travis support.
Make travis work.