right-click, triangle selection problems solved.

Below issues are fixed.

1.Right-click has an issue while sidebar is in Auto/Show hide mode.

2.a.Choose View->Hide Side Bar, b.Select a file under Working Files,
c.Do auto hide/show,
d.Then again choose View->Show Side Bar. In this case you will not see
rectangle pointer. You have to again click on that file to see it.
Update README.md

Known issues are fixed, so removed from README.
Merge branch 'master' of https://github.com/sathyamoorthi/brackets-sidebar-plus

Conflicts:
	main.js
FIX: Minor cosmetic defect with JSLint turned on
Merge branch 'master' of https://github.com/sathyamoorthi/brackets-sidebar-plus