Fix #62 - Make tagnames editable in the markup-view
Only show the toolbar button if the enableToolbarButton pref is set.
Merge pull request #64 from captainbrosset/edit-tag-name

Fix #62 - Make tagnames editable in the markup-view
Add a note about the enableToolbarButton pref and rearrange the 'How to Interact With The Thing' section to cover WebIDE and present the available options in the order most useful to web devs.
Merge pull request #72 from past/hide-button

Only show the toolbar button if the enableToolbarButton pref is set.