Issue 6: Update native DLLs with process killing fix

- Updated to new DLL versions built from changes on the native branch which fix recursive process killing to not kill random processes

While making these changes, as targets of opportunity:
- Added constants to ExitWindows for all flags used
- Upgraded to JUnit 4.10 instead of 3.8 and made a few changes to the various tests to make them run a bit more reliably
- Added IDEA's .idea directory to the ignore list

This is pull request 1 of 2 for kohsuke/winp issue 6.