remove site pkgs from requirements.txt

See http://stackoverflow.com/questions/6627035
add pip install to deploy

The runpip function inside deploy fully installs each requirement in
requirements.txt, one by one.  Therefore, the order in which requirements
appear in requirements.txt *is significant*, so I moved the numpy requirement
to the top of the requirements file.
make deploy fetch from hmslincs
needed deploy enhancements

See https://github.com/hmslincs/hmslincs/issues/152
tweaks to deploy
more tweaks to deploy
more tweaks to deploy
still more tweaks to deploy
add git rev to deployinfo
(previous commit was premature)
small fixes to deploy
fixes issue #156
refactor common functionality between export functions
show an "Endpoints" tab in the Dataset page
- fixes #158
Merge remote-tracking branch 'hmslincs/dave-sean-dev' into dave-sean-dev
Merge remote-tracking branch 'hmslincs/dev' into dave-sean-dev