Changed mobilespec to copy from www/.

The mobilespec app has been moved from the repository's root to a www/ subdirectory.
CB-6899 Fixes exception while parsing master.cfg

github: close #15
Removed an unnecessary block of steps.

config.xml is no longer inside the www directory, so it doesn't need to be copied anymore.
Update cordova repos instead of re-cloning them.
Merge branch 'remove-mobilespec-2M'
CB-7251 Adding medic plugin for new style tests CI reporting
Added a script that calls `cordova run`.
master.cfg: platform test steps via base class and overrides
improve checkout to support custom repos and branches
additional build configurations for windows
windows universal apps support
new script to write test configuration to config.xml
Updates README with actual configuration and notes. (+1 squashed commits)

Squashed commits:

[c9d38ac] updates documentation
Added back logic to update cordova repos instead of re-cloning them
Windows: logic to specify target build version via config

As per cahnges in Windows Universal Apps logic:
* no --store80 switch anymore;
* target version is specified via config.xml:
<preference name="windows-target-version" value="VERSION" />
Use ‘--link-to= ‘ param during ‘cordova create’ instead of manually linking mobilespec/www
Added platfromVersion from platfrom/VERSION file to Grunt step.
Fixed: Running grunt in cordova-js folder failed
Adding platform from downloaded folder instead of npm package
Fixed error with "COHO Clone failed: Invalid repo value: wp8
Use the list-repos command to see value values."
replacing 'windows8' platform with 'windows'