Assign anonymous pours to 'guest' user.

Part of issue #204.
Updated Celery instructions.
Overhauled user detail in KegAdmin

Added ability for superuser  to change e-mail address
Merge pull request #209 from theguardian/mod-user-email

Overhauled user detail in KegAdmin
docs: Add troubleshooting section.

Closes #169 and #182.
Created system tweet form

Closes #208
Merge pull request #211 from theguardian/tweet-test

Create system tweet form.
Update bootstrap source to v3.1.1
Upgrade templates and stylesheets for bootstrap 3

Bootstrap 3 updates

 *Added responsive class to images
 *Fixed image galleries
 *Fixed sub-navs
 *Added active to initial tabs
 *Fixed snapshots

Bootstrap 3 responsive updates

 * Updated badges to make use of responsive col for sizing
 * Changed several columns to sm for better responsive appearance
 * Change to HTML5
 * Add viewport meta data for mobile
 * Fixed up recent activity layout

Remove line-height from kb-badge-small

Fix vertical alignment of badges

More bootstrap 3 fixes

 * typeahead was removed from bootstrap 3
   * added current bundled version of typeahead
   * added required hanlebars.js
   * added bootstrap 3 version of typeahead.less
   * use bloodhound implementation for autocomplete
   * modified autocomplete api to include search tokens
 * fixed user status superuser label
 * fixed inline forms

Fix bootstrap 3 error alerts

alert-error is not part of bootstrap 3. create alert-error class
that inherits from alert-danger.