Update README.md

Include link for script that updates the `.iml` file automatically.
Update to IntelliJ idea 13.1.3
Update Gradle wrapper to 1.11
Updated android plugin version to 0.10.2 and fixed using internal method to using public API introduced in the new version. This is no longer backwards compatible.
Update the Example project to use android plugin 0.10.2 and build tools 19.1