[BUGFIX beta] with-controller has parentController

Closes #4050
Additional tests for with-controller

Ensure with-controller works inside of #each
Ensure _contextController's target is set to parentController
[DOC beta] {{with}} helper docs
Merge pull request #4053 from knownasilya/with-docs

[DOC beta] {{with}} helper documentation
[beta] Update ember-dev to hide passed tests by default.

This speeds up browser tests by default.
Merge pull request #4059 from bcardarella/bc-with-controller-parent-controller

[BUGFIX beta] with-controller has parentController
Merge pull request #4092 from rjackson/hide_passed_tests

[beta] Update ember-dev to hide passed tests by default.
make sure shape of meta doesn't change from prototype
Merge pull request #4093 from emberjs/fix-meta

make sure shape of meta doesn't change from prototype