chore(junit-reporter): 0.2.5-alpha1

This is a major cleanup of the junit-reporter module.
  
  + re-order helper methods to top of file
  + refactor xml back into instance variable
  + refactor execution time calculation
  + refactor most xml generation into helper methods
  + remove 'node-fs' as dependency and usused imports
  + introduce 'ensureDir' as new dependency
  + satisfy jshint (single-quotes, indention etc)