ToolBar: Listen to Action name changes for toolbar actions.

Checkable actions especially change their name in response to
checked state change, toolbar buttons now honor the change in
the action's name and change the button text accordingly.
add links to the online documentation to the README file so the docs can be found
rerun sphinx-apidoc
Change advanced editor area tab switching shortcut to Ctrl+PgUp/Down.

This is a common shortcut used which works in many applications
such as google chrome and firefox.
Merge pull request #90 from pankajp/toolbar-action-listen-name-change

ToolBar: Listen to Action name changes for toolbar actions.
Merge pull request #99 from pankajp/tasks_advanced_editor_area_pane_cange_switch_editor_shortcut

Change advanced editor area tab switching shortcut to Ctrl+PgUp/Down.
Merge pull request #95 from enthought/doc_fix

minor doc fix
Changed other editor area classes to use Ctrl+PgUp/PgDown like PR #99.
Fix Qt CodeEditor pygments monkeypatch conflict with ipython.

Both the Qt CodeEditor and IPython monkeypatch the pygments'
RegexLexer.get_tokens_unprocessed in a slightly different manner,
which meant only the one imported later would work correctly.
This is fixed by now using same monkeypatch as ipython.
Merge pull request #103 from RobinD42/nextprev-tab-keybindings

keybindings update for other editor area classes
ENH: Support menus in toolbars (Qt)

Menus can now be added to toolbar_manager, which shows it
as a toolbutton with a drop-down menu. The default action
can be specified by the `action` attribute on the Menu.
Merge pull request #100 from pankajp/qt_code_editor_pygments_monkeypatch_ipython_conflict

Fix Qt CodeEditor pygments monkeypatch conflict with ipython.
Merge pull request #104 from pankajp/menu_in_toolbar

ENH: Support menus in toolbars (Qt)
Changing `NullColor` to `NullColour` for compatibility with wx 2.9.
Updating CHANGES.txt
Merge pull request #106 from enthought/fix-wx-2.9-incompatibility

Changing `NullColor` to `NullColour` for compatibility with wx 2.9.
BUG: Fix reference to attribute.

Fixes #78.
Merge pull request #112 from enthought/fix/python-editor-event

BUG: Fix reference to attribute.
Merge branch 'master' into python3