Fixed null pointer and access violation exceptions in HTMLTexture.
Updated HTMLTexture to use CEF 1.1364.1123.
Fixed a few issues when running with DCHECK = true:

- Do not ask is a not element node for its element attributes.
- Dispose last child node immediately when traversing.
Removed unused log statements.
Code cleanup.
Updated CefGlue to changeset 131.
CefXmlReader fixes:

- Didn't deal with xmlns:PREFIX="" properly.
- Didn't dispose created DOM nodes properly when reader was disposed of early.
Changed code structure.

- Should be easier now to extend.
- Each texture renderer will block in constructor until corresponding CefBrowser is created.
Fixed #226
When disposing a HTML renderer block until internal CefBrowser is closed.
Fixed Dispose method.
Added new Encode (String Base64) and Decode (Raw Base64) nodes.
helppatch..
Added basic support for future packs.

- add packs/PACKNAME/core to assembly search path
- add packs/PACKNAME/factories to mef container catalog on startup
- add packs/PACKNAME/nodes to node search path
replaced OpenURL in patches
Fix to previous commit - need to resolve reflection only loading too.
Merge branch 'develop-packs-support' into develop