Remove unused code from global.js
Remove empty search.js
Remove unused code from include/xbmc.js
Remove unused app.js file.
Remove unused poster/fanart code.
Remove unused default.html
No need to redefine Ext.BLANK_IMAGE_URL
Remove unused checkWatchedInt
Remove unused unsign() function.
Remove unused code from include/xbmc.js
Comment out a large chunk of broken code.

This code uses the old HTTP API which no longer works. For now comment
out the code and print an error message to the console if it gets used.
Update the change log for Issue #68.
Merge pull request #68 from fyfe/spring-clean

[WIP] Spring clean