Fix a bunch of links.

Note that it's possible to use implicit linking if the link text
is identical to the title of the page you want to link to.
Point out possibility for implicit linking

If link text and title of target page are identical, just write "[Page Title][]"
Rename Writing Policy and Promises section
Take out The Policy Server section.

It repeats information from the Writing Policy... section.
Re-order.

Also, remove CRLF line endings from language-concepts.
Fixed enterprise UI page
Added Chosen and Flot, commented out Piwik.

I made up a title for the Flot license. Please adjust if necessary.
Merge pull request #731 from troubalex/patch-1

Added Chosen and Flot, commented out Piwik.
Roughed in new enterprise pages
Fixed the HighChart entry
Merge pull request #238 from TekHus/master

Modifications to enterprise section
Merge pull request #733 from KevWright/master

Modifications to enterprise section
Merge pull request #732 from troubalex/patch-2

Fixed the HighChart entry
Moved images
Merge pull request #239 from TekHus/master

Moved images
Merge pull request #734 from KevWright/master

Moved images
Changed doc title
Merge pull request #240 from TekHus/master

Changed doc title
Merge pull request #735 from KevWright/master

Changed doc title
Fixed a link