[BUGFIX beta] Added assert mismatched template compiler version.

See #3728. Using an old version of Ember to precompile templates
can result in an unusual error when trying to render a component
in block form, e.g.

```
  {{#my-component}}Hello{{/my-component}}
```

This commit adds an assert to give the user more information
as to what's going on.
Correct GH issue URL referenced in blockHelperMissing comments
[BUGFIX beta] {{partial}} helper now works with bound params

{{partial name}} will look up `name` on
the present template context and render the partial
whose name is the present value of `name`. If `name`
changes, the partial gets re-rendered. If name is
falsy, nothing gets rendered. If name refers to a
non-existent template/partial, the same assertion you'd
see if you'd explicitly passed in an invalid template/partial
name in string form will fire.
[BUGFIX beta] Use RegExp.test() for Ember.computed.match.

After a bit of research I believe that `RegExp.test` is quite a bit
faster and results in clearer code (as it returns a boolean instead of a
match array).

Quote from the MDN article on `String.match`:

    If you need to know if a string matches a regular expression regexp, use
    regexp.test(string).

Supporting research:

http://jsperf.com/test-vs-match-regex
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test
ttp://stackoverflow.com/a/10940138/1157494

Resolves #3746.
Merge pull request #3756 from rjackson/use_regexp_test_for_computed_match

[BUGFIX beta] Use RegExp.test() for Ember.computed.match.
Merge pull request #3745 from machty/bound-partial-helper

[BUGFIX beta] {{partial}} helper now works with bound params
Merge pull request #3729 from machty/block-helper-missing-assert

[BUGFIX beta] Added assert mismatched template compiler version.
[FEATURE with-controller] {{#with}} can take a controller= option

Wrap the context with an Ember.ObjectController