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Added handling for knex-migrator being executed in Ghost 2.0 (#765)

refs #759

- We have moved the execution of knex-migrator into Ghost 2.0.0
- This commit will ensure we skip the db migration when you:
  - migrate from ^1 to ^2
  - you update from ^2 to ^2
  - when you install ^2
- Added net socket server for Ghost 2.0 (alternative to simple port polling)
- way better error handling between Ghost and the CLI
- Ghost 2.0 executes knex-migrator
  - it will turn maintenance on if migrations need to be executed
  - the handling of receiving success or failure state requires a better communication between the CLI and Ghost, because the blog stays in maintenance mode and runs the migrations in background
- Ghost will tell the CLI when it's ready by using an extension: write a socket url into the config and send the success/failure state
- this is much better than using the http socket to communicate, because
  - A) port polling connects to the http port, it's impossible to send simple messages over this transport layer
  - B) the code is much simpler, CLI opens a socket port and Ghost pushes a notification if the notification is available
  - C) we receive any error from Ghost - even if the http server wasn't started yet
- we don't communicate with Ghost, Ghost communicates with the CLI
- port polling for v1 blogs is untouched, still works as expected
- coverage has decreased a very little 0,2% - will try to add more tests when we merge the 1.9 branch into master

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