Added prerequisites with details of getting a Marionette enabled build and connecting to it
Bug 946254 - Submit device firmware details to DataZilla. r=bkelly
Bug 947222 - Get Gaia revision from new app install location. r=bkelly
Bump gaiatest to 0.20 and b2gpopulate to 0.12
Updated change log for 0.13
Bumped version number to 0.13
Create B2GPopulate instances only when needed