First commit after revising frontend slideshow script

Now working on organizing the backend scripts to be compatible with
Prepros. This is still an unusable version of the plugin.
Started rebuilding backend scripts

Non-useable version.
Finished general settings scripts

Moved around some code that belonged to the old versions of scripts. At
the moment the edit slideshow page has no working JavaScript on it.
Finished slideshow edit page scripts

Except for the slide inserter script, which is in another class/file.
Frontend and backend JavaScript has been fully reconstructed

There's still some cleaning up to do in the PHP code, which is in need
of a small restructuring itself. The CSS files as well could be moved
into a single one by using LESS.

The deprecated functions are no longer used.
Text slides now make use of the WordPress 3.5 color picker

This means that the minimum required WordPress version went up to 3.5.
Organized JavaScript files to match PrePros' defaults

Added Japanese translation files
All backend CSS is now LESS
Changed code style of all PHP classes
Changed remaining code style in views

Deleted unused image
Added todo's
Updated text files
Implemented installer method to add loading icon

Created better loading icon
Improved stylesheets
Fixed code placement to solve bugs in IE 6/7/8