Clean slate for v2 re-write

Switching framework (ish) from Turbogears 2 to Pyramid 1.4 for the
version 2 re-write. Okay, not so much of a switch given that Turbogears
was based on Pylons, the predecessor of Pyramid, so a lot of things are
going to wind up similar, but for now this is a fresh start...
Change all ratbot2 to ratbot

We shouldn't be using a different package name. This may be completely
incompatible with the old package, but that's what major version changes
are for!
Rewrite README with the usual links
First stab at pyramid migration

Database model has been migrated, along with a couple of views. Added
foundation5 as the basis for the layout templates and completed a
rudimentary version of the homepage.
Added a standard gitignore
Added error logging for production
Front page works correctly now

Added the start of a rudimentary authz policy (viewers and authors), and
fixed up the front page query so that 6 comics get returned correctly.
Bitmap and thumbnail generation is nearly working correctly but needs a
few more tweaks...
Render SVGs with a white background

In the case of SVGs without an explicit background, ensure the
background is white instead of black
Tweak size of thumbnails for comics overview
Comics overview now working
Issues overview now implemented
Tweaked thumbs to limit size correctly
Fix styles of various pages on mobile

Thumbnails were over-flowing columns and the nav-bars are better suited
to dual-columns on mobile formats
Finished first stab at page viewer

Also simplified the nav styles quite a bit, and the next/prior
properties for issues and pages.
Minor style refinements
Added route and handler for blog

Need to finish the template though...
Added beaker as a dependency
Removed redundant mytemplate
Finished blog implementation

Lots of changes required: removed News from the model (not required by
the design), added a description attribute to Page, and a markup
attribute to accompany all description attributes (indicating the markup
lagnauge that the description is written in).

In order to accommodate the design of the blog list sitting flush with
the top nav-bar several bits of CSS needed alteration requiring minor
alteration to most other pages. Also incorporate LigatureSymbols for the
blog design.

Updated the comics handler to remove the 'blog' comic from the main
comic list and updated the index page to point blog issues at the
blog_issue handler instead of the usual page handler.
Added login integration for Facebook and G+

Added velruse to permit login via Facebook, G+ and (in future) other
OAuth based providers (Twitter, LinkedIn, etc). Added User to the model,
updated the security module to use the new model, and appropriate links
to the homepage.