Added autoWatch variable assignment to test.conf  for convenience.
Added tests for "placeholder" option in single and multiple sortables.
Wrapped a really long line according to @CyborgMaster.
Changes savesNodes placeholder's detection.
Now uses exact match of palceholder class attribute.
That's to handle the case that the placeholder class equals
the sortable's items class.
Added code coverage and moved jquery-simulate to devDependencies.
Merge pull request #65 from thgreasi/angular1.2

Closes #62 and possibly #47