Register the runtime callback at the top level view rather than having
each conversation view register independently.
Also refactors Layout into InboxView.
After a message is saved asynchronsly, fire an event and pass the
message attributes to frontend listeners via the chrome-runtime API.
This behavior is similar to the 'storage' event fired by localStorage.
Getting up and running with IndexedDB was pretty easy, thanks to
backbone. The tricky part was making reads and writes asynchronous.
In that process I did some refactoring on Whisper.Threads, which
has been renamed Conversations for consistency with the view names.
This change also adds the unlimitedStorage permission.
Also,
* moved fetch out of the list view
* removed unused #last() function
* put test setup lines in their own tiny file.
* added data-cover to view script tags for code coveage reports.
The layout class is the only class that should have knowledge of
page-level constant markup, such as #gutter and #contacts, and
should be pretty much the only place we find elements by id (with
the exception of template elements).
This change removes references to #gutter from views. Rather than
hardcoding assumptions about page layout, view elements should
ask the layout to insert themselves into the main content area by
calling Whisper.Layout.setContent.
Each conversation views now manages its own separate elements
rather than all binding to a shared #conversation element, and
similarly for message composition ui.
Also includes the beginnings of group creation UI (not working yet),
featuring bootstrap-tagsinput field for entering group recipients
Let ConversationListItemView save a reference to its corresponding
ConversationView. This lets it render or delegate/undelegate events
when opening and closing a conversation.
Similarly for ConversationView itself, which contains a MessageListView.
