Updated CHANGES with a link to the AI wiki page.
Merge pull request #1954 from davebaol/changes

Updated CHANGES with a link to the AI wiki page.
Fixed knobBefore not being optional.

closes #1951
Merge branch 'origin/master'
Javadoc warnings.
Renamed execute method to update in State class.
Added flush.

ImmediateModeRenderer20 actually allows `end` to be called multiple times without matching begin calls, but it is better for the API to provide `flush` than to rely on that behavior.
Avoid field lookup in loop.
Fork TableLayout for libgdx.

http://www.badlogicgames.com/wordpress/?p=3458
Refactor Value so context is always an Actor.
Refactor Container to use Value.

closes #1955
Removed null checks for Cell values.

The values are only null to indicate the value is not set. This only occurs for column, row and cell defaults. Once the cell values are merged with the defaults, none of the values should be null. The getters are only useful to call after the cell has been merged with the defaults.
Minor cleanup.
Removed old package.
Merge pull request #1958 from davebaol/ai

Renamed execute method to update in State class.
Fixed Container generics.
Merge branch 'origin/master'
Added markup to test.
Removed a non existant model

This model does not exist (anymore). When it is selected via the UI of the test, the test crashes.
Merge pull request #1967 from nooone/patch-1

Removed a non existant model