While the debugger is running, ignore SIGINT (since the debugger handles it and we don't want ios-sim to exit) and handle SIGCHLD by exiting so ios-sim doesn't outlive the debugger.
Added CONTRIBUTING file
Fixes #86
Added initial Xcode6 beta (6A215l) support
Merge pull request #91 from robovm/xcode6-beta-pr1

Added initial Xcode6 beta (6A215l) support
Merge pull request #83 from gnachman/master

Improve signal handling while the debugger is running
Merge remote-tracking branch 'upstream/master'