Potential workaround for #932: force modal-less UI on IE.

This isn't a great workaround, as it boots the user off the issuer's site
and redirects them to the backpack without an easy way to return to where
they came from, but it's much better than what currently happens. And it
avoids the legal issues involved in delivering a P3P header that makes
the modal issuer flow "just work".
Document Issuer API issue_no_modal
Merge remote-tracking branch 'toolness/issue-932-workaround' into docs

* toolness/issue-932-workaround:
  Potential workaround for #932: force modal-less UI on IE.
Change .issue() docs to reflect force modaless UI on IE
Added es5-shim.js and its minified version.

From kriskowal/es5-shim@e5e3fe995f77ddf3350431c464423ddcab49d9f0.
Add IE8 support to fakeissuer.

Also dynamically generate the Issuer JS API URL, rather than hard-coding
it to localhost.
Add es5-shim script to layout.html and badge-accept.html.
Fixes to issuer.js for modalless issuer API flow.

Doing this with issuer.js is a bit challenging because we don't want
to modify the prototypes of the client page, so we can't just add an
es5 shim.
nunjucks 0.1.10 seems IE8 compatible
Fix `awardBadge` to bake images
Add ability to `solo` tests
Fix potential windows issue.
Add `baked` field for images
Bake badges on the way out!
Test SVG badges with award.
Continuing to move wiki docs into docs/:

  * restructured to put API docs under docs/apis/...
  * added displayer API docs
  * adding additional docs to thin out wiki landing page (content not yet removed from wiki)
  * updating README links to point away from removed wiki pages
Update to latest version of validator, bakery.

* Enables SVG badges
* Fixes DataURLs
Use `preferredImage` again
Fix potential Windows issue
Fix variable name