Revamp ui design (part 1)

Changed graphs to show one large view, with mini graphs
Relocated canary to be under the admin dashboard

Added links in the instances pane to view canary statistics

Introduced query param 'metrics' to specify initial metrics to show,
eg. canary_hosts/foo/?metrics=foo,bar*,b*t

Note: here, * is a special character that matches 0 or more characters
(equivalent to .*). Full regex was not used because common characters
like . would have to constantly be escaped.

Reviewed by Maddy - small style changes were made. Relates to OS-207.

Change-Id: I40b44c76dfde83eabea4ec3476d36055fb792a00