changed slot grouping
Merge branch 'master' into themes-review
retrieved the right image attribute
added a control to skip Content formatting when the Content attribute does not exist
trailing spaces
changed the CMS behavior when the website needs to change its theme. To change the theme, you must map the templates in use to the templates bundled with the new theme, then AlphaLemon CMS recreates the pages using the new theme. To recover the contents,  the user matches the slots with the old theme, directly on the website, using inline interface [ci skip]
finished new themes management