Better head-show-* options. fix #142
Merge branch 'v0.6.x' into develop

Conflicts:
	assets/angular-gantt.js
	src/logic/headerGenerator.factory.js
Updated repo links to angular-gantt
Update settings and copyrights
Fix missing strings related to description/subject refactoring.

Closes #145
Few changes in marketing stuff
Remove demo from main repository (see angular-gantt-demo repository)
Update demo link and bower.json
Update readme
Move demo back to main repository
Update .gitignore
Update license copyright holders and master demo URL