Merge branch '400-new-theme-editor'
fix for windows paths in theme-editor, slashes fix to removed double and reverse windows slashes.
private inprogress
Updated codemirror to 3.0
re coding code folding and newline
Changed all the remaining functions to use caching
Added file exists check for sitemap.xml
Code tidy
fix issue #469
Updated codemirror to 3.0, made all relevant changes.
Slight gutter line number alignment issues on some themes, not sure whats causing it yet.
Updated dependancies
uploadify 3.2
Fixes for some errors creating thumbs.
rewrote some style names as necessary

Uploadify always has success true, ill have to figure out whats going on there and how to better detect issues and mark them as failed.

added minified version
Added salt safeties to install.php
Will kill if authorization fails to save.
Will kill if SALT is empty.
Changed salt use.
Will use GSUSECUSTOMSALT now always if defined.
Will use authorization.xml api_key if not.
Will DIE with helpful missing file error if else.
Removed duplicate install.php from inc folder
Rewrite for health check and supporting functions

Major Health check chages and rewrite.
Update admin/inc/common.php

temp fix for broken svn
health check fixes for windows fileperms.
file 644
dir 744
css adjustments
translation generics added, more cleanups

Added generic terms for translation.
These are useful for buttons or actions or plugins that want to add a
bit of i18n to their plugin without the overhead of maintaining their
own translations I their plugin.
load cached pages into header 

to make available to backend pages
typo fix
cleaning up some functions

removed redundant code
Fix for authorization check bug on install

Added check for missing install.php, in case data files were wiped after
install avoid confusing 404 redirect.
fix for authorization.xml check fatal bug