add non-prefixed border-radius property
add non-prefixed box-shadow property
add non prefixed linear-gradient function
remove vendor prefixes for border-radius
remove vendor prefixes for box-shadow
remove mozilla vendor prefix for linear-gradient
[ci skip] added link for trello board
Update newrelic_rpm dependency to version 3.6.1.88
Update puma dependency to version 2.0.1
Update tilt dependency to version 1.4.0
Use regular double quotes, instead of fancy quotes, so that copying and pasting into a terminal works correctly.
Update excon dependency to version 0.21.0
Merge pull request #560 from delba/css

Add non prefixed CSS3 properties
Merge pull request #562 from westonplatter/master

[ci skip] added link for trello board
Move rvm downgrade to before_install
Update multi_json dependency to version 1.7.3
Update shoulda dependency to version 3.5.0
Update dalli dependency to version 2.6.3
Update net-sftp dependency to version 2.1.2
Update cucumber dependency to version 1.3.1