New tests skeleton and examples using pytest

Instructions (from the project root):
1. pip install -r requirements-devel.txt
2. py.test
Merge pull request #37 from ikame/pytest

New tests skeleton and examples using pytest
Configure PYTHONPATH when running py.test
Some integration tests for auth api.
Merge pull request #38 from ikame/pytest

Integration tests
First implementation of history api.
WIP: api views draft for obtain history.
WIP: add page number parse method.
WIP: intial work on query services functions.
WIP: woking on api.
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WIP: change migration to new model.
WIP: Fix tests after the rebase of master
WIP: Move base.notifications to projects.notifications and make a refactor over projects.mixins
WIP: more freezers.