Add test for setting undefined layout.

Bump version to 0.2.4.

Remove extraneous helper.

Apply healthy dose of duck tape.

- cc @tmeasday: Can you test this out in your app and see if things start
  breaking? Tests are passing, and things seem okay in a simple demo app. I
  wasn't able to test in EM because of other updates I need to make to work with
  the latest 0.8.0-rc3.

- Special thanks to @avital from Core for helping with this issue!

- Hopefully fixes [Issue 553](iron-meteor/iron-router#533)

Bump version.

Clean up data issues...

- In lookupTemplate don't call the data function before calling the helper
  method. This sets up an unnecessary dep.
- Be safe by calling get() in nonreactive block
- API cleanup

Embox the data value...

- So we can reuse the cached value of the data across multiple lookups.

Fix merge issues