dynamic_background 6.x-1.5

This release contains an improved interface for build extensions and have a new blog extension.

* Updated the README.txt file to reflect the new extensions
* Added the new blog sub-module
* Added new helper function to create the image selector
* Renamed the panels sub-module css behaviour variable to match the other sub-modules
* Added better support for different CSS behaviours form each sub-module
* Fixed hard-code css styling in css menu callback
* Added hook_dynamic_background_css() to handle the CSS generation process for sub-modules
* Added CSS behaviour form function to use by sub-modules
* Addd page manager dependency to panels sub-module