Changes

* [mdas] {{miss|fix }} the import script leak(landed, but backed out)* [mdas] {{defer|write }} up and add some marionette/gaiatest endurance unit tests to catch space consumption/performance regressions* [ahal] {{done|write }} mozharness script for running mochitests on B2G desktop builds* [wlach] {{done|finish }} implementation of npm mirror for rel-eng (re-writing in node.js and documenting)* [rwood] {{ok|Endurance }} test fixes/maintenance for inari master/1.3* [rwood] {{ok|Further }} work on AWSY emulator test driver* [rwood] {{ok|Continued }} support for games benchmarking on Firefox OS