Fixes CB-2109 device.platform value in audio

The audio test file relies on device.platform in order to create
the file for recording on iOS.  Had to be updated to look for the
new value of "iOS"
Updated version to 2.3.0
Add tests for reading sliced files.
Add a test that reads a native Blob with a FileReader.

Related to: https://issues.apache.org/jira/browse/CB-2206
[mobile-spec] CB-2216: Bench ArrayBuffers
Add autotest for fetching file:/// with FileTransfer.

https://issues.apache.org/jira/browse/CB-2183
[CB-2213] Added a test for NATIVE_URI.

The test uses the camera to get the native URI of an image from the device's photo library, and uses that URI to display the file's info.
Add manual test for lazy-loading of cordova.js

https://issues.apache.org/jira/browse/CB-1978
Make ArrayBuffer benchmark in bytes, and wrap calls with setTimeout