Altered the /bin/bash line to use the /usr/bin/env command to
acquire the location of bash from the environment.  This should
work on Linux/OS X/FreeBSD.  FreeBSD puts bash in /usr/local/bin
instead of /bin/ so builds don't work without modification there.
Removed the FreeBSD export CGO_LDFLAGS option, as the workaround listed is no longer needed,
and breaks the build using any recent go on FreeBSD 10.
Merge pull request #385 from sarlalian/master

In FreeBSD bash is located at /usr/local/bin/bash instead of /bin/bash