Alter back key press behavior

onBackPressed will go back to previous step
Update AndroidManifest.xml

Remove SDK from Manifest.  These values are not used, as the gradle build overrides them.   These values might be aggravating a Android Studio manifest merge bug when including the repo in a project with a different targetSDK.
Upgraded to Gradle 1.11 and Android Gradle plugin 0.9.+
Configured Github wiki as a submodule in docs folder
Updated release notes
Merge pull request #38 from denny0223/pr

Alter back key press behavior
Added support to install the library to local maven repository and pushed version to 1.2.0
Updated release notes 1.2.0
Moved manifest properties to gradle build files
Merge branch 'develop'