[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