CB-6549 use relative path to link assets

Changed: Use relative path instead of absolute path, to link the
cordova-mobile-spec repository with the mobilespec project. This is needed
for Windows-based dev workstations.

github: close #59
CB-6550 added/updated README.md

Added: Requirements & instructions to use createmobilespec module.
Updated: project setup usage.

github: close #60
CB-6525 Assert that fs.root.toURL() does not use cdvfile:
Don't use new File or new FileWriter in tests. Use getFile() and createWriter().
CB-6491 add CONTRIBUTING.md
Restore change that was accidently lost in a pull request.
CB-6571 Add test for DirectoryEntry.toURL() having a trailing slash
CB-6583 Add file tests that have spaces in paths
Replace innerText with more standard textContent to fix manual battery test for firefox OS
Set VERSION to 3.6.0-dev (via coho)
CB-6616 add flow for plugman

Fold createmobilespecandroid-usingplugman into createmobilespec.js using
a new "--plugman" flag. Supposedly should also work for platforms other than
Android.
CB-6631 FileReader - clear test data between specs
CB-3440 [BlackBerry10] Add platform specific logic to file-transfer tests

- BB10 uses local:/// rather than file:///
- BB10 does not support progress on gzip encoded requests
CB-6657 - 3 FileTransfer tests have false negatives
CB-6659 - False negative in network connection type 'cellular'
CB-6678 [wp8] added windowsphone to the ignore list
CB-6682 [BlackBerry10] Add access elements for bb10 whitelisting

- The platform doesn't respect *.apache.org
- Access to file:// requires a whitelist entry
CB-6695 Added tests to verify CB-4520 + CB-4519
CB-6616 Add --global option

Added --global option as a separate code path that uses the globally-installed
cordova and plugman, downloaded platform and plugins from the registry, and
the local git repo for mobile-spec. This can be used for testing release
candidates or released versions.
CB-6616 add --skipjs option

Add the --skipjs option which will skip the step of overwriting the platform's
cordova.js file with a freshly generated one from the local cordova-js git
repo. Useful in rare circumstances for testing RC and production releases.