* Replaced every muikku-placeholder "icon" --> they were too big
* CK Plugins has updated placeholders aswell
* Fixed css @extend icon-delete issue
Merge branch 'FTR-44_material-editor' of
https://github.com/otavanopisto/muikku.git into FTR-44_material-editor

Conflicts:
	muikku/src/main/webapp/resources/theme-muikku/gfx/form-elements/memofield-eval.gif
	muikku/src/main/webapp/resources/theme-muikku/gfx/form-elements/memofield-prac.gif
	muikku/src/main/webapp/resources/theme-muikku/gfx/form-elements/textfield-eval.gif
	muikku/src/main/webapp/resources/theme-muikku/gfx/form-elements/textfield-prac.gif
Merge branch 'FTR-44_material-editor' of https://github.com/otavanopisto/muikku.git into FTR-44_material-editor
* Changed location of placeholder images inside plugins of ckeditor
* Replaced remaining placeholder images