* Updated every workspace material file (xhtml, js and scss) so every
classname and id is properly named
* Added goback widget for material's management view
* Seperated material's management view from reading view
Merge branch 'FTR-44_material-editor' of
https://github.com/otavanopisto/muikku.git into FTR-44_material-editor

Conflicts:
	muikku-core-plugins/src/main/resources/META-INF/resources/workspaces/materials-management.xhtml
	muikku/src/main/webapp/resources/scripts/gui/workspace-materials-management.js
* Fixed few wrong class name isues
Merge branch 'FTR-44_material-editor' of https://github.com/otavanopisto/muikku.git into FTR-44_material-editor