CB-5020 - File plugin should execute on a separate thread
[CB-5010] Updated version and RELEASENOTES.md for release 0.2.4
[CB-5010] Incremented plugin version on dev branch.
CB-5015 [BlackBerry10] Add missing dependency for File.slice
CB-5128: added repo + issue tag to plugin.xml for file plugin
CB-5129: Add a consistent filesystem attribute to FileEntry and DirectoryEntry objects
add ubuntu platform
[CB-5188] Updated version and RELEASENOTES.md for release 0.2.5
CB-5188:
1. Added amazon-fireos platform
2. Change to use amazon-fireos as a platform is the user agent string contains 'cordova-amazon-fireos'
[ubuntu] change location of persistent dir
CB-4816 Fix file creation outside sandbox for BB10
CB-5405: Update JS code to use URLs exclusively
CB-5406: Update iOS native code to use filesystem URLs internally
CB-5408: Add handler for filesystem:// urls
CB-5406: Factor out filesystem providers in iOS
CB-5406: Split iOS file plugin into modules
CB-5403: Bump File plugin major version
CB-5406: Extend public API for dependent plugins

The FileTransfer and Media Capture plugins depend on
internals of File; new methods have been exposed for the benefit of
FileTransfer, and old methods restored for Media Capture.
[ubuntu] use cordova/exec/proxy