added retrofit and 'test' login request and response classes, plus api wrapper
Added the move task request and response api
Renamed files
Added zxing to the project, added qr code reader activity to the app
Merge commit '37bfc5e9f208b1ab4b01c81ae42ba15606d996eb' into ui-login-screen

Conflicts:
	magiccardwall/app/app.iml
	magiccardwall/app/build.gradle
	magiccardwall/app/src/main/AndroidManifest.xml
	magiccardwall/app/src/main/res/values/strings.xml