Detect Composer Autoload File

Detect if Composer's autoload file can be find in the vendor directory in this project (if this project is the root package), otherwise assume that this project has been installed as a dependency and load the root package autoloader.
Fixes #10, though needs community feedback on method used.
bug #14 Detect the correct Composer autoloader (mynameiszanders)

This PR was merged into the 1.0-dev branch.

Discussion
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Detect the correct Composer autoloader

Pull request for issue #10. Feedback would be appreciated.

Commits
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2055bc2 Detect Composer Autoload File
Enable SIGINT handler