Improved runtests script

Fixed bug (related to django 1.6?) regarding avoid_wrapping
Added ability to use command line arguments to select which test(s) to run
Fixed bug in GFKQuerySet.none (query was not emptied)

Possibly django 1.6 related

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extra : amend_source : c9a70015dde725110ed99f55037a30a8e847c6cc
Added a tests baseclass
Added the tests that should pass once verb sorting is activated

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branch : verb_sorting
Added VerbField to Follow class

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branch : verb_sorting
Added verbs argument to actions.follow and unfollow

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branch : verb_sorting
Added verbs argument to following / followers methods

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branch : verb_sorting
Added following_dict and followers_dict to ActionManager

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branch : verb_sorting
Added verbs support for the ActionManager's user method

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branch : verb_sorting
Added verbs-aware __unicode__ method to Follow object

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branch : verb_sorting
Added RST doc

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branch : verb_sorting
Made docs conf.py compatible with Django 1.6
Added test that should pass once unread actions are implemented

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branch : unread_actions
Added track_unread and unread fields to Follow model

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branch : unread_actions
Adapted follow function

Slightly changed the requirements => adapted tests

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branch : unread_actions
extra : amend_source : a5749e0734ba4bea0b094b1f616567f647f1a931
Adapted querysets and managers

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branch : unread_actions
extra : amend_source : be6991f873b41d61668268cc112b6e6263787d18
Added test that should pass with newly created Actions

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branch : unread_actions
Added TRACK_UNREAD_DEFAULT setting

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branch : unread_actions
Changed requirements (anterior actions no longer considered as unread)

Updated tests

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branch : unread_actions
Added last_fetched to Follow model to retrieve unread actions

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branch : unread_actions