Metaforms updates.
1.Partially working dynamic nested forms for Metaforms.
 Can add/remove metarows in Metaform creation page.
 However, there is a bug that prevents deleting metarows from the edit page.

2.Added some unit tests for Metaforms.

3.Clicking "back" in a document redirects to collections index page.

4.Fixed a unit test problem for project helper unit test.

Signed-off-by: shanesuofi <shanes@vandals.uidaho.edu>