bumped various versions, fixes to make sprest compile on 2.11
added 2.11.2 scala version to travis ci build definition
Bumped spray to 1.3.2 due to incompatibility with spray-json, fix for specs2 test (matcher.toSet has been deprecated in favour of collection matchers)
Merge pull request #24 from mruflin/master

bumped various versions, fixes to make sprest compile on 2.11