update build.xml to use intellij version 13.
Merge branch 'master' of https://github.com/mustah/TabSwitch

Conflicts:
	TabSwitch.ipr
using java 7
removed author javadoc of mine
release notes updated
using less than or equals.
forgot a <br/> in release notes
updated build version and plugin version
- fixed bug.
- do not show when no files are open
Remove TabSwitchSetting. No longer used.

New version of the plugin is also created. Version 3.0.6, where the
unused class is removed from the source code.