[CB-2599] Added a step to the upgrade guide.

AssetsLibrary.framework is necessary when upgrading to 2.4.
Also fixed some odd numbering issues.
[CB-2612] added instructions for upgrading BB for 2.1 from 2.0
[CB-2611] added instructions for upgrading Blackberry for 2.2 from 2.1
[CB-2611] - added in minor instruction for bb10
Fixing docs for Android for CB-2448
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-docs
[CB-2384] Add new iOS Project Setting to suppress the form accessory bar above the keyboard
[CB-2645] fixed command line usage on BB to reflect changes to scripts brought in by CB-2381, requests 3 arguments, domain ignored
[CB-2670] wrote quirks section for BB file system edge case uncovered in CB-2649
[CB-2411] Added CameraPopoverHandle documentation.
CB-2525: Correct docs for iOS splashscreen sizes

-correct to sizes from http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html
Updated iOS documentation for disallowOverscroll.
Updated docs for FileTransfer.download headers

As per issue CB-861, I have updated the docs for FileTransfer to list the optional headers
Clarification of "Basic authentication"
[CB-1687] Added Camera.Direction documentation.

Also, fixed spacing issues; couldn't resist.
[CB-2659] Added documentation for NATIVE_URI.
CB-2490 Describe NetworkConnection.type.CELL

- add CELL type
- updated examples
- updated WP7 / WP8 usage
- added deprecation note for iOS
[CB-2695] amended blackberry quirks section with file edge case solutions
[CB-2308] Document loaderror event
CB-2677: Doc adding prompt to Notification API

-added new notification.prompt.md file with API and samples
-updated to include prompt in Notification API reference