Delete cache after updating theme. Add admin max upload size setting . Syntax error fix. Allow '@' and '#' in passwords.

After changing theme, delete cache to make sure theme updates immediately after refresh. #1352 
Added setting for admin to change the max upload size. Default is set to 10Mb. #1358 
Fixed syntax error in update script that caused 'Undefined constraint Kohana' error reported in #1330 
Added '@' and '#' as allowed characters when settings passwords to match the displayed error message #1309