Updated the build_path to be more selective over what paths it chooses (This should prevent chosing the wrong helper leading to seg faults)
Improved error messages when ADC fails to setup
Check for null file handle when opening AIN to prevent seg fault
Added a retry to reading for the analog inputs to avoid a bug where reading back and forth between two analog inputs would cause the resource to be unavailable every 16 scans
Corrected the readback of the success bit to correctly check for a read and raise an exception on failure
Merge pull request #45 from zthorson/master

ADC Fix: Conflicting Device Tree would Set Fault