Support Google Glass SDK in build.gradle

The Google Glass SDK requires a line in the form:

    compileSdkVersion "Google Inc.:Glass Development Kit Sneak Peek:15"

The previous code ended up thinking the API version was `"Google`. This
patch properly gets the final API number from a quoted text string as
well as just the single number if presented in the form:

    compileSdkVersion 15
Merge pull request #13 from ViViDboarder/support-sdk-version-strings

Support Google Glass SDK in build.gradle