Add entityTypes hook.

Closes #79

Using 'is empty' on a FieldValueChangeComparison Civirule Condition

Check for fields before inserting/renaming. A new install was failing…

Check for fields before inserting/renaming. A new install was failing on DB upgrade steps 1001,1002 for me

@Vgratioulet thanks for this!

- hasSubtype to check the subtype(s) of a Contact

- SubtypesChanged to compare subtype(s) before and after change

- Fixes some notices

- in the form, when chosing 'is empty'
the field for 'the value to compare to' is hidden for the orginal value,
the same way as for the new value

Allow Managed entities for Civirule Triggers

Updated the Case Status change action. When a case status is set to a closed case status also end the case roles.

Remove invalid argument warning from count()

Thank @PalanteJon !

Making Administer > CiviRules multisite compatible

This is related to Issue #123.

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