Set errors on model

This makes it possible to handle server side errors on the client side.

Function was copied from the ActiveModelAdapter (https://github.com/emberjs/data/blob/v1.0.0-beta.8/packages/activemodel-adapter/lib/system/active_model_adapter.js#L102) and modified to work with DRF.
Fixed test
Merge pull request #88 from chripede/patch-1

Set errors on model
update ember cli instructions
Release v1.0.4
Release v1.0.5
Clean up readme
Remove bower badge
Add community section
Add links to pending issues
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Update CHANGELOG.md
Update CHANGELOG.md
2-space indent
More linting
Correct documentation issue reference.  Thanks @valberg
Implement date and datetime transforms
Clean up karma config
Use UTC values for testing
Remove extra html