Minor code cleanup
Rename error-handling routine

From <VaccineReturnNegativeTwoOnError> to <VaccineFailOnError>
Tests: tune a target initialization timeout
Update .gitignore

* Remove Xcode stuff
* Ignore build_tests directory
Reduce a remote thread stack size
Never return KERN_FAILURE from exception handlers
Merge branch 'fix/dont-crash-target' into develop

Never return KERN_FAILURE from exception handlers.
Close #14
Merge branch 'develop'

* Project code cleanup
* Minimized .gitignore file
* Decrease a remote thread stack
* Catch all exceptions inside a target, so it won't crash