Adding hooks for Global TearDown in Calabash to reset Web App State
Downgrading to Calabash-android 0.4.20 due to calabash-android query console bug in 0.4.21
Adding custom Calabash Login Step
Adding Integration tests for Register, Save and Edit Child Details
Merge pull request #129 from tomclement/master

Adds integration test optimisations (teardown, custom login) and child registration integration tests
Removed unnecessary plugins, bumped android dependency version