Add tint color to config_schema.json
Merge with Peter's next.
Merge branch 'next' of github.com:apptentive/apptentive-trigger-io into android
Update config schema. Stop tracking development directory in demo app.
Remove overloaded JS api. Fix java API engage method, except for extendedData portion. Update automated tests. Fix inspector default config.
Update iOS to version 1.6.0
Added `willShowInteraction` Forge binding method for  `willShowInteractionForEvent`.
Now using a single `engage` method rather than overloading.
Fixes for setting tint color from module config.
Update engage() method in module.js and API.java. Update Automated tests.
Finalize API and module for Android. Update automated tests. Update demo app.
Merge branch 'android' into next
Update module version, android artifacts.
Update demo app with working engage method. Add back in methods accidentally reverted in API.java.