Only process each mouse up & down event once at either canvas or window

Internet explorer will only trigger mouse events at the window level. If
the handler is bound to both window and canvas however, the event will
be processed twice in every other browser.

A solution to this is to track manually (without affecting the bubble or
other features on the event) that an event has been processed, and don't
process it a second time.
Merge pull request #199 from peitschie/click-dup

Only process each mouse up & down event once at either canvas or window
Remove no longer needed spans for menubar (slipped the last cleanup it seems)
== Op-ify member data handling ==

* New operations: OpAddMember, OpRemoveMember,
OpUpdateMember.
* Member data is now handled in a memberDataManager
instance inside OdtDocument.
* Any operations must be executed only if a member
is present within this model.
* All polling code for member data has been removed;
colors, names, and images now instantly update
whenever a member data operation is executed.
* Added relevant entries to the OT Matrix.
Remove terrible hack for setting the dc:creator
field's text in an annotation; now that we
have first-class access to member data,
we can set this value directly within
OpAddAnnotation.
 Changes related to MemberData w.r.t Annotations:

 * Remove old artifacts from AnnotationViewManager.
 * Make OpUpdateMember updated all dc:creator elements
 that have been labelled with an editinfo:memberid attribute.
 * Add tests for member data operations in conjunction with
 annotations.
 * Add a member "Alice" by default in OperationTests.js,
 so that annotations in tests can also have an author name.
Assert in core.EventNotifier that there are no duplicated event ids registered
Remove all occurrences of MemberModel and TrivialMemberModel
Merge pull request #189 from adityab/memberops

Op-ify Member Data
Update Closure compiler and more typechecking.
The type Runtime.ByteArray is removed. Uint8Array is used instead.
The more rigorous type checking is enabled by the flag --jscomp_error reportUnknownTypes.
To compile with this flag, build the target typecheck-target.
Revert CC for now.