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.
because we dropped the scala version 2.9.x, how about making this 1.4-SNAPSHOT, so those who are still on 2.9.x can continue to use the current 1.3-snapshot version, and upgrade scala and this module all at once as time permits ?