B2gperf

* Bumped gaiatest dependency to 0.20
* Bumped b2gpopulate dependency to 0.12
* Get Gaia revision from new app install location
* Submit device firmware details to DataZilla

* Bumped gaiatest dependency to 0.19
* Bumped b2gpopulate dependency to 0.11

* Changed homescreen pages locator to work on both 1.2 and 1.3
* Disable the keyboard first time use screen

* Tests can now populate device content
* Added custom launch tests
* Refactored so scroll and launch tests can be more customised

* Output HWComposer FPS values to debug log
* Move cleanup within error threshold measurements
* Require device name to be provided on the command line
* Improve debug logging for DataZilla fields
* Fix homescreen scroll fps test and scroll through all pages of apps
* Add video scroll fps test
* Add music scroll fps test
* Add messages scroll fps test
* Improved scrolling in browser app
* Improved scrolling in contacts app
* Add gallery scroll fps test
* Add settings scroll fps test
* Disable the keyboard FTU screen
* Add support for gathering FPS measurements from the HWComposer logs

* Remove case sensitivity from scroll fps tests
* Fail early if the app does not support scroll fps tests
* Add median to displayed results