Allow fw_sig params to be sent in headers

Gives us an alternative to the existing parameter-based implementation
Also update source control management for Webs in 2014
Also should update that readme, it's over 4 years old at this point...
Code review feedback
more code review feedback
readme cleanup
Merge pull request #2 from websdotcom/FWB-40684-webstore-module-backend

FWB-40684-webstore-module-backend