Minor changes to tab.js
Merge branch 'configurator' of https://github.com/blackhydrogen/noop-sewi into configurator

Merge
Tab Component Update
1. Added tab constants to common.js
2. Code Refactoring to remove magic numbers on panel positions
3. Added Partial functionality to remove components after they have been added(works up to 3 panels now)
Tab Component Update
1. Added remove support up to 4 panels.