[CB-4752] Incremented plugin version on dev branch.
[CB-2901] [BlackBerry10] Automatically unsandbox filesystem if path is not in app sandbox

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Tested by Tracy Li <tli@blackberry.com>
[CB-4763] Copy FileHelper.java into the plugin.
[CB-4764] Move DirectoryManager.java into file plugin
Fix compiler/lint warnings
[CB-4771] Expose TEMPORARY and PERSISTENT constants on window.
Rename CHANGELOG.md -> RELEASENOTES.md
CB-4889 renaming org.apache.cordova.core.file to org.apache.cordova.file
[CB-4903] File Plugin not loading Windows8
CB-4889 renaming references
[CB-4903] File Plugin not loading Windows8
Merge branch 'dev' of https://git-wip-us.apache.org/repos/asf/cordova-plugin-file into dev
CB-4889 bumping&resetting version
[CB-4915] Updated version and RELEASENOTES.md for release 0.2.3