added BehatTestPage for running pagepart behats tests
always add the new page as sub-page of the BehatTestPage
added context functions to test pageparts
add option to change the page template via behat
fill in fiel fields with spaced labels
create behat tests for generated pageparts
Merge branch 'master' into behat_pageparts

* master:
  fix faker dependency - needed for image provider...
Merge pull request #136 from Kunstmaan/behat_pageparts

Create behat tests for generated pageparts