Listen for "init" hook instead of "didInsertElement"
Listen for "init" hook instead of "didInsertElement"

The "didInsertElement" hook was being fired after some of the
initialization for the sl-menu component was able to occur, resulting in
the children property not properly being instantiated as an array before
it was used.

notmessenger/sl-ember-components,theoshu/sl-ember-components,softlayer/sl-ember-components,Suven/sl-ember-components,alxyuu/sl-ember-components,azizpunjani/sl-ember-components,erangeles/sl-ember-components,erangeles/sl-ember-components,jonathandavidson/sl-ember-components,Suven/sl-ember-components,juwara0/sl-ember-components,SpikedKira/sl-ember-components,alxyuu/sl-ember-components,notmessenger/sl-ember-components,softlayer/sl-ember-components,azizpunjani/sl-ember-components,SpikedKira/sl-ember-components,juwara0/sl-ember-components,theoshu/sl-ember-components