made the when/unless combinators for Results lazy
remove mentions of the "fat" specs2 jar in the documentation. fixes #266

Conflicts:
	guide/src/test/scala/org/specs2/guide/Runners.scala
use Scala 2.11.4

Conflicts:
	project/build.scala
better description of the Markdown module
refactorings of Fold functions
added an option to the Markdown printer
fixed a compilation error in the CreateOnline doc
use offline prettify files