updated PresetManager

fixed bug: skip empty strings
added support for 'allowUpload' field in skeleton
added initialize code for PresetManager in webant.py
added logging stuff

 - added logging capabilities to PresetManager
 - added loggers initialization code to webant
[ PresetManager ] simplified skeleton controls code
[PresetManager ] code cleaning
Add skeleton support in html. Add add.html page
add error page
changed add.html layout/javascript
[ add item ] updated add.html style, added preset select
[add item] added preset selector and upload file support
[add item] make lenguage selection much easier
added webant.presets submodule to setup.py
[ add book ] added preset div in form
test