Add project statistics and convert to sortable table

This commit changes the previous alternative internet project index into a sortable table with project statistics sourced from ohloh.net.

To achieve this, every project currently in the README.md was converted to a JSON file, found in projects/. Pull requests for new projects should be done by adding a new JSON file in the projects/ folder and using the included update.py to regenerate the README.md files.

For more info, see the included CONTRIBUTING.md.
Added more comments to the update script
Added more documentation
Add link to CONTRIBUTING.md in project index
Stubborn JSON file
Script is now compatible with both python2.7 and python3
Removed descriptions readme which is not used.
Merge branch 'master' of https://github.com/wtud/alternative-internet
Reran the new update script with improved number rounding