Support for 2.11

In relation to #3, this PR fixes the compile error under Scala 2.11

Specs2 also no-longer supports tests that have no result, so I've adjusted the test accordingly.  To keep our life simple, I've **dropped Scala 2.9 support** here, to avoid support different specs2 versions of this test.

My editor has trimmed white space at the end of lines, too.