Moved scripts into module
Make gdc2 a module
Added githubarchive.org parser
Added note about older githubarchive.org files
Added loaddb script and models
Fixed issues with database loader

* githubarchive.org archives aren't perfect
* Workaround some bugs in parsing
Updated requirements
repository url is important
Updated ignore
Added some key queries
Updated Makefile to reflect new commands
Removed bigquery based script
Merge pull request #10 from davidfischer/local-database

Switched to local database instead of bigquery