avoid exception due to console miss on IE 8
Allow jQuery version 1.11 and 2.1

Both RC1's of jQuery 1.11 and 2.1 have just been released.

(I screwed up last PR)
Merge pull request #4172 from Costent/master

avoid exception due to console miss on IE 8
Merge pull request #4181 from dimitrisuls/patch-1

Allow jQuery version 1.11 and 2.1
[FEATURE composable-computed-properties] Several CCP Fixes.

- Make CP implicit keys calculate correctly when they have no dependent keys.
- Remove some dead code.
- Test expressions that differ only in non-cp args.
- Support CCP depkey paths.

Dependent keys are used to form the implicit key for a CP, so here we replace
'.' to ensure the resulting key is not interpreted as a path by `Ember.get`.