Feature/alternative mountpoint

Hey,

many thanks for your script, its very nice.

I'm currently fiddling around with a build server and concurrent jobs. Just take a look and let me know what you think :)

The option makes it possible to seperate each build with a $JOBID or something similar.

Cheers,
Jan
Do you know if the script used to handle volume names with a space in between? Everything up to this line works well for a volume named "MyApp v1.2.3", but here you lose the ability to distinguish.

What I usually do is to use a Bash array for argument options:

    ATTACH_OPT=()
    ATTACH_OPT=(-mountpoint "${MOUNT_DIR}")

and then include it using

    ... "${ATTACH_OPT[@]}"

NOTE 1: not tested, may contain typos (I don't use bash arrays very often, after all).

NOTE 2: if the script did not work with volume names that contain a space before, then maybe it's not worth to worry about this.