MyStockPortfolio: corrected issue with pro-guard introduced in android studio 1.0.0 rc4

If you are updating from Android Studio 0.8.x to Android Studio 1.0.0-RC, you'll need to update your Gradle plugin version from 0.13.x to 1.0.0-rc4. There were a couple of last minute API changes; for example, change "runProguard" to "minifyEnabled", etc. See the release notes underhttp://tools.android.com/tech-docs/new-build-system for more details on the changes if you run into build/Gradle sync issues.
MyStockPortfolio: corrected issue with pro-guard introduced in android studio 1.0.0 rc4