Adding TravisCI config and badge
Adding Coveralls
. changed demo link back to codeplant
Changing ruby 2.1.0 to 2.1.1 in travis config
. CHANGELOG
Merge pull request #148 from simonc/adding-travis-and-coveralls

Adding travis and coveralls
. changed URLs of badges
. forgot the important part :-)
. cosmetic
. changed coveralls badge link (as proposed by coveralls.io)