Updates project to process web hooks async via sidekiq.

A new queue of "project_web_hook" is used to process web hooks asynchronously, allowing each to succeed/fail (and be retried) independently.

(Basically, project web hooks now process the same as system hooks.)
Fix application crashes after #2772
Fix projects in admin -> user -> show
Missed environment added to 'Try fixing it' block
Merge pull request #2784 from AlexDenisov/gitlab_check_environment

Missing environment added to 'Try fixing it' block
Add projects page to dashboard. Remove projects pagination on dashboard
Dashboard to resource
Make group name a link at header
Fixed dashboard show specs
Fix features
feature tests
Merge pull request #2787 from gitlabhq/features/projects_page

Feature: Projects page
Pager.js to coffee
Merge pull request #2768 from rlaneve/feature/queued-web-hooks

Updates web hooks to process via queue
Add deploy.html for symlink if maintaince
Updated commit diff view with some minor visual modifications
Prepared diff view for multiple view modes

Converted commits.js to coffeescript
image info in separate coffeescript file

Added swipe view mode

Added onion skin viewMode
Merge pull request #2153 from koenpunt/commit-diff-views

Added swipe view for image diff
fix tests
remove incorrect information about the api version

The API version is currently not equal to the gitlab major version number. Gitlab 4.1 
still uses API version 3. Point to the lib/api.rb file instead which contains the
autoritative information.
Fix rake task - Update method name