Fixed all current formatter tests

This PR fixes the reminder of the failing tests currently in the plugin.
Asside from the tests, I've added an override for the tab settings, I need to check with JetBrains if this can be done more cleanly.
Also, I've improved tests as GO will remove the unused imports but it's not relevant to the current tests scenario.
Next will be adding more tests as the current state of the formatter still doesn't match what ``` go fmt ``` from go 1.2rc3 outputs.