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* new mobile-friendly style
* removed lightbox code in favor of css-driven approach
* simplified upload-progress code

I got tricked by the browser retaining the previously selected option
on page reload. So let's add tests, like it should have been done in
the first place.

This should allow jQuery to be upgraded to 1.9+.

Usage as shown that Coquelicot was often used to exchange huge files that
might take quite some time to be uploaded. Sometimes even more than an hour.
In that case, the file would be immediately expired. Not the best user
experience.

So let's bump the default to one day. This should be less surprising to users.
Admins can still get back to the previous default of one hour using the
configuration file.

sass creates its cache directory in sometimes unpredictable locations. In order
to make it configurale, we now define a cache directory in Coquelicot. We then
tell sass to use a subdirectory there put cache its files.

Based on a patch by Rowan Thorpe.

coquelicot_spec without knowledge of the best practices. So let's ditch it
and reimplement the integration tests using Cucumber. The less purposed
tests were mostly for the authentication methods, so they are now covered
using new specs.

Now that we are using Capybara everywhere, we can remove hpricot from
the dependencies.

A new task 'test' will run both RSpec and Cucumber.

Otherwise we get a warning that they are loaded in a non thread-safe way.

Drop the constraint for haml-magic-translations as it will likely be
kept in sync with haml itself.

 * expect(collection).to have(n).items → expect(collection.size).to eql(n)
 * expect(predicate).to be_true → expect(predicate).to be true
   (because they are predicate and we want the value to be exactly 'true')

gettext is already listed in runtime dependency.

We add a new `path` setting to do so.

Address Debian bug #722528.

Address Debian bug #741421 reported by Rowan Thorpe.

Thanks Loïc Raimbault!

Ruby 2 and onwards drop support for syck.

Otherwise tests using Timecop fail when active_support is loaded.