Added requirements for doc

requirements-doc.freeze

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+-e .
+alabaster==0.7.10
+apipkg==1.4
+appnope==0.1.0
+attrs==17.3.0
+Babel==2.5.1
+certifi==2017.11.5
+chardet==3.0.4
+codecov==2.0.10
+coverage==4.4.2
+decorator==4.1.2
+Django==1.11.8
+django-debug-toolbar==1.9.1
+django-haystack==2.6.1
+django-js-asset==0.1.1
+django-mptt==0.9.0
+django-widget-tweaks==1.4.1
+docutils==0.14
+execnet==1.5.0
+factory-boy==2.9.2
+Faker==0.8.7
+flake8==3.5.0
+idna==2.6
+imagesize==0.7.1
+ipython==6.2.1
+ipython-genutils==0.2.0
+isort==4.2.15
+jedi==0.11.0
+Jinja2==2.10
+markdown2==2.3.5
+MarkupSafe==1.0
+mccabe==0.6.1
+mock==2.0.0
+olefile==0.44
+parso==0.1.0
+pbr==3.1.1
+pexpect==4.3.0
+pickleshare==0.7.4
+Pillow==4.3.0
+pluggy==0.6.0
+prompt-toolkit==1.0.15
+ptyprocess==0.5.2
+py==1.5.2
+pycodestyle==2.3.1
+pyflakes==1.6.0
+Pygments==2.2.0
+pytest==3.3.1
+pytest-cov==2.5.1
+pytest-django==3.1.2
+pytest-forked==0.2
+pytest-pythonpath==0.7.1
+pytest-spec==1.1.0
+pytest-sugar==0.9.0
+pytest-xdist==1.20.1
+python-dateutil==2.6.1
+pytz==2017.3
+requests==2.18.4
+simplegeneric==0.8.1
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.6.5
+sphinx-rtd-theme==0.2.4
+sphinxcontrib-websupport==1.0.1
+sqlparse==0.2.4
+termcolor==1.1.0
+text-unidecode==1.1
+traitlets==4.3.2
+transifex-client==0.12.5
+Unipath==1.1
+urllib3==1.22
+uWSGI==2.0.15
+wcwidth==0.1.7
+Whoosh==2.7.4