Added view:publish command, fixes #2146

- Fixed copy+paste errors in ConfigPublishCommand
- Added ViewPublisher
- Added ViewPublishCommand
- Modified PublisherServiceProvider to include references to new ViewPublisher and ViewPublisherCommand
- Added tests for ViewPublisher and ViewPublishCommand

Unit tests run correctly, and I have tested in an actual app environment too.

These changes will also work against 4.1 (master) branch.