Cleaned node_modules to save 35M
Adding procedure to clean node_modules
Create CONTRIBUTING.md
Update platform submodules & CLI snapshot to 3.3.0. Update cordova-plugin-file to current dev branch

cordova-android is actually a couple commits past 3.3.0 to include the defaults.xml commit.
Revert "Add scan-manifest internal command for pre-prepare hook"

This reverts commit c01132095c6d8e6171e355bdaa62e3bde390a972.
It was blanking out the appID, and was not preserving config.xml
formatting
Updating chrome-cordova submodule