Shuffle requirements, add in travis file

.travis.yml

+language: python
+python:
+  - "2.7"
+virtualenv:
+  system_site_packages: true
+before_install:
+  - sudo xargs -a apt-packages.txt apt-get install
+install:
+  - pip install -r base_requirements.txt
+  - sudo apt-get install python-matplotlib python-numpy python-scipy python-sklearn
+  - pip install nltk==2.0.3 scikit-learn==0.12.1
+  - sudo mv nltk_data /usr/share/nltk_data
+before_script:
+  - python manage.py syncdb --settings=edx_ora.settings --pythonpath=. --noinput
+  - python manage.py migrate --settings=edx_ora.settings --pythonpath=. --noinput
+script:  python manage.py test --settings=edx_ora.testsettings --pythonpath=. --noinput
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base_requirements.txt

 lxml==3.0.1
 mock==0.8.0
-nltk==2.0.3
 nose==1.2.1
 path.py==3.0
-pip
 pylint==0.26.0
 pytz==2012h

full_requirements.txt

--r pre-requirements.txt
--r requirements.txt
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requirements.txt

@@ -5,3 +5,4 @@ scipy==0.11.0
 scikit-learn==0.12.1
 sphinx
 django-sphinx-autodoc
+nltk==2.0.3
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run_tests.sh

-nosetests --with-coverage
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+nosetests --with-coverage  --cover-package=ease
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