Add rudimentary haystack search
Add urls.py
Add required packages to pip_packages.txt
Merge pull request #123 from stephenpaulger/develop

Search WIP using haystack with elasticsearch backend. Known TODOs:
- lock down to only searching objects related to Organizations that the current user is a member of 
- think about where the search box should be and how we display the results (currently it's a whole new screen)
- figure out installation instructions for dependencies (eg. elasticsearch, java) and add these to README