added Zxing lib
Code added to return the product code via barcode scanning
Added IntentIntegrator and IntentResult classes
removed files from android/src/com/example pkg
Removed unused imports
Fixed XML layout issue
Merge branch 'master' into scaning

Conflicts:
	android/src/com/aj3/kiss/AddItemActivity.java
Merge branch 'master' into scaning
direct user to install free barcode scanner by default, not paid one
fixed xml that was broken during merge
Merge branch 'scaning' of https://github.com/jsjones27/kiss into scaning

Conflicts:
	android/res/layout/activity_add_item.xml
	android/src/com/aj3/kiss/AddItemActivity.java
Merge pull request #27 from jsjones27/scaning

Barcode Scanning