Update TableChangeEvent to use newTableName naming convention.

Update TableChangeEvent to use newTableName naming convention.

This makes the class more consistent with GWT naming conventions.

* src/main/java/org/glom/web/client/activity/DetailsActivity.java:
Update for method name change in TableChangeEvent.
* src/main/java/org/glom/web/client/activity/ListActivity.java: Update
for method name change in TableChangeEvent.
* src/main/java/org/glom/web/client/event/TableChangeEvent.java: Update
newTableName variable and getter method. Make toDebugString()
actually work.