Added implementation("com.google.code.gson:gson:2.8.4") and patch for…

… xxe attack

Update proguard.

Update sample

Merge remote-tracking branch 'origin/test'

# Conflicts:
#	build.gradle
#	gradle/wrapper/gradle-wrapper.properties

Merge remote-tracking branch 'origin/test'

# Conflicts:
#	build.gradle
#	gradle/wrapper/gradle-wrapper.properties

update library version for chuck lib

Add ChuckContentProvider.java for no op

Add method to export the cached data.

disable sample

update dependencies