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Merge remote-tracking branch 'refs/remotes/MacPaw/master'
Updating sample project settings (recommended by Xcode).
Adding example to make getting started easier.
Cleaning up ARC code.
Returning early on error.
Implementing support for LLManagerSetLaunchAtLoginFailedNotification.
Improving readability.
Setting projects to use spaces for indentation.
Adding license to file headers.
Check if scheme can be opened before opening

This commit adds a check to the helper that will retrieve
the path to the app that responds to the given scheme. Failure
to retrieve this path means the app does not exist on the
system and the scheme shouldn't be called.

It's a fix for a rare case when the container app has been
moved to the Trash, but the helper is still in launchd. The OS
will throw errors stating the scheme can't be opened.
Merge pull request #5 from JanX2/master

Improvements
Merge pull request #6 from DangerCove/verify-scheme

Check if scheme can be opened before opening