content types should have charsets as well

- When POSTing chinese characters to a play server,
  the existing ning client required this modification
fix ruby client spec
Merge pull request #256 from gilt/mreed-content-type-charset

Add charset to the content types on ning and ruby client
Upgrade to scoverage 1.0.1

Note this changes you how do coverage tests, from:

    sbt scoverage:test

to

    sbt coverage test
Upgrade .travisci.yml to scala 2.11.4
Merge pull request #258 from ebowman/travisci

Upgrade .travisci.yml to scala 2.11.4
Merge pull request #257 from ebowman/master

Upgrade to scoverage 1.0.1
Upgrade libs