Remove the hacked-in before_filter

current_user is now called by the new_applicant? and pending_applicant?
before_filters, so there's no need for it to be one itself.
Remove a duplicated rescue_from

There's another call to this just a few lines up! I'm guessing it was a
poorly-resolved conflict.
Fix a series of failures when running under spork

When running the full test suitte under spork, I got errors:
     NoMethodError:
            protected method `pending_applicant' called for
            #<ApplicationController:0x007f92e903c950>
The errors didn't happen when running without spork, or when running the
application_controller_spec in isolation. I'm not sure why this fixes
it?
[whitespace] Convert tabs to spaces
Fix some errors when testing under spork

When running the specs under spork, I was getting weird errors:
Failure/Error: project.comments.first.get_project.should eq project

expected: #<Project id: 420, title: "Thing", description: "Stuff",
            start_date: "2014-03-02", end_date: "2014-04-02",
            user_uuid: nil, created_at: "2014-03-02 21:13:07",
            updated_at: "2014-03-02 21:13:07", image_file_name: nil,
            image_content_type: nil, image_file_size: nil,
            image_updated_at: nil>
     got: #<Project id: 420, title: "Thing", description: "Stuff",
            start_date: "2014-03-02", end_date: "2014-04-02",
            user_uuid: nil, created_at: "2014-03-02 21:13:07",
            updated_at: "2014-03-02 21:13:07", image_file_name: nil,
            image_content_type: nil, image_file_size: nil,
            image_updated_at: nil>

These are the same. I'm not sure why equality failed. Just checking the
ids ensures we're really getting the right record, and avoids the weird
equality-failure.
Allow specifying pre-existing users [#86]

Since we have an existing member network, we should allow users who're
already code scouts members to log in without having to go through the
application process.

Creating a stubbed-out application is a lil' goofy but should reduce
database trips on most requests.
[whitespace] Whitespace cleanup
Factor out common test behavior [#86]
Merge pull request #94 from AndrewLorente/preload-existing-members

Allow specifying pre-existing users [#86]