Whitespace only
Add some braces for clarity
Whitespace only
Whitespace only
Give more meaningful error message when trying to run programs

On non-Windows, the child thread now comunicates any errors back to the
parent thread via pipes.
Add a test for better exceptions when ewxecuting programs
Fix process010 on OS X

true and false aren't in /bin on OS X. Now we don't hardcode the path.
Fix process004 following the error improvements
Fix build on Windows
Add Windows output for process004 and process010
Fix process004 on Windows