Updated default Vagrant dependency version
 * Now using 1.4.0 as the default version for development.
Fixed superflous warning message when using ruby >= 2.0.0
 * Fixes issue #14.
 * Setting YAML::ENGINE to 'syck' on 2.0.0 generates a warning message
   saying 'syck' engine was removed. This fix this problem.
Updated README for Vagrant version tested with
Merge branch 'fix-14' into 1.x
Released version 1.4.1
Bumped to 1.4.2.dev1