Add module import validation

- Add new dev dependency grunt-es6-import-validate
- Add validate-imports run to buildScripts task
- Add configuration in tasks/options/validate-imports.js
- Add whitelist for resolver module
Fix test loader for dasherized file names.

Commit 036df2e2c00aee broke the test loader so that no test modules were
found or loaded, and no tests run.
Merge pull request #504 from alisdair/master

Fix test loader for dasherized file names.
jj-abrams-resolver now lives under the module name "ember/resolver" per stefanpenner/ember-jj-abrams-resolver#27
Merge pull request #506 from jayphelps/resolver-rename

jj-abrams-resolver now lives under the module name "ember/resolver"
Update to Ember 1.4.0 and Ember Data 1.0.0-beta.7
Merge pull request #507 from bradfol/update

Update to Ember 1.4.0 and Ember Data 1.0.0-beta.7
Fixed minor comment typo
Merge pull request #518 from existentialism/patch-1

Fixed minor comment typo
Merge pull request #502 from jgable/addImportValidate

Add module import validation
[fixes #521]
Rename _eak_seen to entries
Merge pull request #524 from teddyzeenny/entries

Rename _eak_seen to entries
[Fix #525] Make import validation optional
Merge pull request #528 from MajorBreakfast/master

[Fix #525] Make import validation optional
Update README.md
Update README.md
restore grunt-es6-import-validate as a default package
animate dom rerender only in development env
Merge pull request #529 from andrewfan/rerender_animation_only_in_dev_env

animate dom rerender only in development env