-- Missing BAMs were appearing as StingExceptions
-- Missing VCFs were showing up as CommandLineErrors, but it's clearer for them to be CouldNotReadInputFile exceptions
-- Added integration tests to ensure missing BAMs, VCFs, and -L files are properly thrown as CouldNotReadInputFile exceptions
-- Added path to standard b37 BAM to BaseTest
-- Cleaned up code in SAMDataSource, removing my parallel loading code as this just didn't prove to be useful.