Move dependencies to gemspec
Revert "Commit gemfile.lock"

This reverts commit 8515b6fa208d79203f2ad397461487539335ba94.
Install development dependencies in CI environment
Add whitespace to .travis.yml
Test against multiple Rails versions

Allow failures on 4.1 for now
Test against multiple Rubies
Merge pull request #73 from zoombody/test-matrix

Improve test matrix