Resolves issue-102

[corytodd]

The SEGFAULT string generated by the compiler was falling through the
success check in execProcAsync. Add a new string and to match SIGSEGV and add corresponding elif to mark compileSuccess as false.

This is tested Debian 8.

Create a simple binary:

echo "old bin"

Run "Compile and run current file" through Aporia

Now add some segfaulty stuff. This is a snippet from Nim issue 4003:

echo "new bin"

proc boo(p: proc)

proc quux(p: proc) =
    discard

proc boo(p: proc) =
  discard

Prior to this patch, executing "Compile and run current file" would show a segfault message and then run the old bin resulting in "old bin" printing in the output window. The patched version shows the segfault message and quits.

Fixed #102

[dom96]

This seems kind of hackish, I think the underlying issue is that osproc doesn't think the Nim process returned with an exit code of 1. So osproc needs to be fixed.