Add sf task to manage plugins
Rename file according to its contained class
Support 1.x/2.x db upgrades, refs #4494

Apply new database upgrades selectively depending on the milestone.
Small fixes
Simplify code comment
Add fks support in addColumn (QubitMigrate)
Add information_object.source_metadata_id column

I'm adding an extra column to store the source standard
(refs #3891). TODO: add taxonomy and terms. Migration added,
taking this chance to do more migration testing (refs #4494).
Create lib/task/tools dir
Add dates column to actor/browse, fixes #4444

Squashed commit of the following:

commit 7cf3a5739bc839f158d40722e0746cbd6c0207c4
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Sat Dec 22 16:11:29 2012 +0100

    Add dates of existence on actors browse list
Add information object templates taxonomy/terms

Using the new migration scripts (arMigration0094 class, refs #4494),
this commit adds the needed taxonomy and terms regarding to the new
switch template feature based on source standard (refs #3894).
Merge branch 'issue-4494' into 1.x.

Fixes #4494. See the issue page for more details.

New migration scripts are located under:
- lib/task/migrate/migrations/*.class.php
The existing ones can be used as examples.
Merge remote-tracking branch 'origin/1.x'

Conflicts:
	apps/qubit/modules/actor/templates/browseSuccess.php
Set milestone to 2 in the 2.x branch