Added demo plugin plugin code.

Added the code necessary for the demo_plugin plugin.
Added script to grant execute rights and public synonyms if the code
user and ppliction user re not the same.
Added variations of the same image.

Added variations of the same image.
Added jQuery UI theme chooser

Added the ability to change th jQuery UI theme.
Added code of demo plugin

Added code of the demo plugin and moved code needed for the application
from source to ppliction
Theme chooser dynamic instead of on submit

The theme is now changed without submitting the page.  dynamic action is
used instead. Also fixed some template bugs.
Added substitution strings to install script.

Added substitution strings to install script.
Make changing theme work for http and https.

For the jquery theme files is a cdn is used. To make this work both the
website as the cdn must be either http or https.
Updated the documentation.
Merge pull request #8 from nvanbaren/Cleaning-up-plugin-and-appliction

Cleaning up plugin and application