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Fix django-netjsonconfig issue #62

Add hostname validator to Device.name:

First of all, ensure you know

How to reproduce the issue: try to save a new device with name test device.

Result: netjsonconfig validation complains test device is not a valid hostname and the validation error is shown in the configuration section.

Test: write a unit test that triggers the validation error and checks the message_dict property of the exception contains a key named "name".

Fix: now implement the fix for your test by writing a hostname validator for the name field.

More paranoid tests: write more paranoid unit tests that ensure legitimate names are allowed and invalid names are not, be creative in trying different cases that you didn't think for.