The project is using an unsupported version of the Android Gradle plug-in (0.7.3).

[flocsy]

When I tried to open the project in Android Studio 0.8.9 I got the following message:

"The project is using an unsupported version of the Android Gradle plug-in (0.7.3).

Starting with version 0.9.0 incompatible changes were introduced in the build language.
Please read the migration guide to learn how to update your project."

[rfay]

@flocsy try #117 and see if it sorts it out for you.