update sketchily to fix FF issue

[#55090748]
update sketchily, fixes FF positioning, adds new API

the new API allows lara to tell SVG canvas to recheck
the browser features after the dialog is made visible
use new sketchily api to recheck svg features
image question: truncated answer below thumbnail 

[#55175486]
Update deprecated exception method

Note that I'm still getting an error in Guard (not a test failure, just an error message) which seems to be related to this. Only shows in Guard, not when you run `rspec spec/` or `rake spec`. http://stackoverflow.com/q/18339850/306084
update displayed answer text

[#55175486]
Hydrofracking background image [#53912853]

New image for background in Hydrofracking theme. This is far too big in terms of file size, however; we need to scale it down.

https://www.pivotaltracker.com/story/show/53912853
Replace Hydrofracking SVG background with PNG

[#53912853] This uses a smaller file-sized PNG for the background.

https://www.pivotaltracker.com/story/show/53912853
MIGRATION: one user can have multiple authentications

this allows one user account to be linked with multiple
portal accounts. This change does not include any UI
to take advantage of this.

[#55550912]
add custom maintenance page

[#55632524]
Merge branch 'master' into staging