Update readme for v0.1.1
Merge branch 'dev'
Update readme for v0.2.0
Update .gitignore
Add updated gradle files

build.gradle is now set to prompt the user for keystore data when building
a release APK. Closes #42.
Comment out "release" lines in build.gradle

The change introduced in fd29e3fcaf25a17db03a43c67288a708a63f0a99 prevents
Gradle from building the project in Android Studio. We'll need to manually
uncomment these lines before building a release APK.