Modified ruby from 2.1.2 to 2.1.5
Merge branch 'dev' of https://github.com/Growstuff/growstuff into upgrade_ruby_version
Update .travis.yml

upgrading ruby 2.1.2 to 2.1.5
Added myself to Contributors.md
removed whitespace
Merge pull request #462 from kevieyang/upgrade_ruby_version

Modified ruby from 2.1.2 to 2.1.5