The MIT license doesn't require that all files be prepended with this
licensing or copyright information. Realm confirmed that they're ok with this
change. This will enable some companies to contribute to SwiftLint and the
date & authorship information will remain accessible via git source control.
`fatalError` prints the full path of the file, which leaks filesystem information from the machine that built the binary. Now that we release via CocoaPods, this is more critical.
by adding an explicit `import Dispatch` and disabling the `atexit_b` call
on Linux. This just means that we won't be able to guarantee that the print()
buffer will have been flushed at program exit. Hopefully this doesn't
cause too many issues.