Working b2g emulator

To get working b2g emulator:
- Use Ubuntu14 VMWare image, 60GB storage, 4GB memory
- Follow https://developer.mozilla.org/en-US/Firefox_OS/Building_and_installing_Firefox_OS
 - Build mozilla-central firefox also on it (see bug 1002545):

# hg clone http://hg.mozilla.org/mozilla-central
# cd mozilla-central

# ./mach bootstrap

# ./mach build
# export XULRUNNER_DIRECTORY=$PWD/obj-x86_64-unknown-linux-gnu/dist

Then go to B2G folder and run ./mach mochitest-remote 

Loop Client testing

Between FirefoxOS Phone (Flame) and Firefox Nightly desktop

1. In terminal: git clone https://github.com/mozilla-b2g/firefoxos-loop-client
2. Follow instructions at: https://developer.mozilla.org/en-US/Firefox_OS/Using_the_App_Manager#Quick_setup
3. Add the packaged app firefoxos-loop-client
4. Make a call on the firefoxos-loop client
5. Open Firefox Nightly on desktop, open the url that was shared with the firefoxos-loop-client app url.
6.