Track fetched if it's missing on submit
Convert all Ruby hashes to 1.9 sexy syntax

All the hashes with key-value pairs in the form of:

  :symbol_key => 'a value'

have been converted to the "sexy syntax" introduced in Ruby since version 1.9,
that is:

  symbol_key: 'a value'

I think it's cleaner and it makes code more readable while not affecting it in
any other way. It's not a performance effort in any way.
Merge pull request #1659 from whatyouhide/master

Convert all Ruby hashes to >= 1.9 sexy syntax
Upgrade pony
Upgrade rouge
Upgrade will_paginate-bootstrap
Stick progress stats in a presenter
Updates to joined.erb

Based on [this conversation](https://github.com/exercism/exercism.io/issues/1618#issuecomment-48494051), here is a framework for the verbiage.
Wordsmith on About page

This may benefit from some fancy styling.  And I am not purporting this is yet perfect.

Katrina: I respect your words (at the bottom) to tell __your story__ and only made a few changes that, in my opinion, made it 'read' a bit smoother.
Improved the wordplay on Exercism

It required a bit of a search but I located [Meliorism](http://www.thefreedictionary.com/meliorism) in order to [admittedly 'force'] the play on Exercism as Exercises that make you a better coder.
Merge pull request #1658 from ParkinT/wordplay
Fix failing sanity check
Collapse the navbar on mobile devices

When accessing exercism.io from a mobile device, the navbar wraps around
the screen and doesn't look nice. Make it look better by using
bootstrap's collapse plugin and collapsing the navbar when on mobile
devices.
Merge pull request #1664 from mattr-/fix-navbar-on-mobile

Prettify the navbar when browsing on mobile devices.
Trigger dependent destroys on submission
Add cleanup task for orphan comments
Add recognition for nimrod exercises
Use path to determine track and slug. See #1663
Add redirect for legacy setup pages
Update show.erb