GUI-1148: Add "Cancel" link to each step of launch config wizard.  Allow "Cancel" link on launch instance wizard to return to instances page.  Fix "Cancel" link in launch config wizard to go to the launch configs page rather than the instances page.
Merge branch 'develop' into GUI-1148

Conflicts:
	eucaconsole/static/js/pages/instance_launch.js
	eucaconsole/static/js/pages/launchconfig_wizard.js
Merge pull request #838 from eucalyptus/GUI-1148

GUI-1148: Fix broken/missing Cancel links on launch config and launch instance wizards