Closes #20

Added support for tox. Installing tox (via pip install tox) and then running the command `tox` at the top level will create a separate venv and search through the entire nidaba project for py.test tests to run.
Merge pull request #23 from sopython/dev

text, code should be list
Update README.md
Merge pull request #25 from sopython/dev

rewrote strip_tags function using beautifulsoup
Added __version__ to /nidaba/__init__.py
Added Chillar's PR
Fixed tox integration
Merge branch 'master' into dev

Conflicts:
	nidaba/core/objects.py
	nidaba/core/test/test_objects.py
splitted requitement files