Set version numbers to 2.1.0 for final release

Merge pull request #369 from chrismayer/version-bump-2.1beta3

Set version numbers to 2.1.0-beta.3

Merge pull request #365 from chrismayer/master

Set version numbers to 2.1.0-beta.2

Merge pull request #357 from bentrm/layernode

Dispose layer tree node event listeners.

Merge pull request #339 from marcjansen/mergeable-extjs5

Support both ExtJS 4.2.1 and ExtJS 5.1.0

Set version to 2.0.3 for release.

Update Version.js

Set Version to 2.0.2 for release

Set version to 2.0.1 for bugfix release

Set GeoExt.version to 2.0.0.

Set `GeoExt.version` to `2.0.0-rc.1`.