Added proper multifile execution on the GoInspectionTestCase.

One more test passing.
BuildTags is failing.
Removed obsolete run configurations.
Fixed another test case.
fix 5 ignored failed test cases
add isNil to GoLiteralIdentifier
Merge pull request #933 from bronze1man/pr-test1

fix 5 ignored failed test cases
Added a nil type to the type system.

Marked a bunch of code pieces for review.
Disabled failing test (temporarely)
Add feedback submission facility to the plugin