Fix a bug with spaces in cmd line args. #40
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When volumeName or dmgName contain spaces or special characters and there is a background image, the runCmd fails because it is interpreted literally and spaces are not escaped. This change passes the command line as separate chunks which are handled properly.
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When volumeName or dmgName contain spaces and there is a background image, runCmd fails because it is interpreted literally and spaces are not escaped. Because of this, hdiutil thought they were separate arguments.
This was only an issue with the runCmd routine -- commandLine was already handling it correctly.