Fix https://github.com/mozilla/thimble.webmaker.org/issues/674 - remove items from file tree context menu
Fix https://github.com/mozilla/thimble.webmaker.org/issues/674 - remove items from file tree context menu

nucliweb/brackets,Rajat-dhyani/brackets,sedge/nimble,mozilla/brackets,sgupta7857/brackets,dangkhue27/brackets,mozilla/brackets,mozilla/brackets,No9/brackets,ashleygwilliams/brackets,sedge/nimble,goldcase/brackets,SidBala/brackets,ScalaInc/brackets,Live4Code/brackets,simon66/brackets,ScalaInc/brackets,Th30/brackets,Th30/brackets,sedge/nimble,sgupta7857/brackets,Live4Code/brackets,nucliweb/brackets,mozilla/brackets,humphd/brackets,No9/brackets,flukeout/brackets,raygervais/brackets,sgupta7857/brackets,ashleygwilliams/brackets,nucliweb/brackets,Live4Code/brackets,Live4Code/brackets,simon66/brackets,raygervais/brackets,dangkhue27/brackets,mozilla/brackets,flukeout/brackets,sgupta7857/brackets,SidBala/brackets,dangkhue27/brackets,flukeout/brackets,No9/brackets,raygervais/brackets,Rajat-dhyani/brackets,No9/brackets,Rajat-dhyani/brackets,flukeout/brackets,humphd/brackets,goldcase/brackets,sedge/nimble,humphd/brackets,ScalaInc/brackets,nucliweb/brackets,flukeout/brackets,ashleygwilliams/brackets,ScalaInc/brackets,goldcase/brackets,ashleygwilliams/brackets,dangkhue27/brackets,SidBala/brackets,humphd/brackets,SidBala/brackets,simon66/brackets,goldcase/brackets,ScalaInc/brackets,Live4Code/brackets,No9/brackets,sedge/nimble,humphd/brackets,Th30/brackets,ashleygwilliams/brackets,SidBala/brackets,goldcase/brackets,Th30/brackets,raygervais/brackets,raygervais/brackets,nucliweb/brackets,simon66/brackets,Th30/brackets,Rajat-dhyani/brackets,dangkhue27/brackets,sgupta7857/brackets,Rajat-dhyani/brackets,simon66/brackets