Refactor to create entries of content_type 'event'
Refactor to create entries of content_type 'event'

In this commit:
* Accepts an optional parameter lib_cal_id from the calling
spec
* Passes libCalId as an argument to the create method
* Sets 'title' and 'slug' to nil for all cases except when creating
event with content_type 'page'

ndlib/QA_tests,ndlib/QA_tests,ndlib/QA_tests