Motivations:
* Iron-Router foces us to use Tracker.nonreactive black magic in order
to avoid un-necessary re-renders;
* There is a community consensus (supported by some MDG members) that
the flow-router API is easier to reason about;
* The useraccounts now supports flow router (that was a blocking
element when I considered the switch ~3months ago)
On the server we use the Picker router, as encouraged by the Kadira
team (which develop both Flow and Picker routers).
In the current state of things there are some bugs related to the
missing Loading architecure. Previously onRendered callback where
always called when the data the component needed was available, now
we have to handle this ourselves, which we will in a following commit.
Both sandstorm and LibreBoard have significantly evolved since the
last release of LibreBoard on sandstorm. This commit:
* adds some more attributes on the sandstorm manifest
* introduces support with the sandstorm sharing box
* uses a server redirection to point to the board document
* hides the top shortcut bar on sandstorm
Fixes#163.
