Solve the Issue with Exceeding 100 URL Map Entries

Solve the Issue with Exceeding 100 URL Map Entries when doing
deployments to App Engine.

Change-Id: I43265fa300cc98d4439c2c0bacd22e1fb245d739
Added warning for too many screens

Change-Id: Ia536ef43a3ae71f3c8deef235d337eaf2f9e52d3
Replace ampersand by "and" in version string to avoid AAPT bug

Change-Id: If9d1a9e25a422430689ef118e876e76b76764f83
Improve documentation for EdgeReached

Change-Id: I03cc84c858cf374bb39a6d750f1fbee3e92d20f6
Merge branch 'master' of https://github.com/mit-cml/appinventor-sources into menu