Upgrade Ember version range to 2.7.0+
Upgrade Ember version range to 2.7.0+

pete-the-pete/ember-inspector,maheshsenni/ember-inspector,emberjs/ember-inspector,sly7-7/ember-inspector,cibernox/ember-inspector,Patsy-issa/ember-inspector,pete-the-pete/ember-inspector,karthiick/ember-inspector,emberjs/ember-inspector,teddyzeenny/ember-extension,sivakumar-kailasam/ember-inspector,sivakumar-kailasam/ember-inspector,maheshsenni/ember-inspector,teddyzeenny/ember-extension,karthiick/ember-inspector,cibernox/ember-inspector,Patsy-issa/ember-inspector,teddyzeenny/ember-inspector,sly7-7/ember-inspector,teddyzeenny/ember-inspector