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Changing the working directory in a sub-subshell
does not change the working directory of the executing
shell.

The substitution was broken for me on _all_ my machines,
so I started looking into the business.

If the current directory has spaces, the script fails to change paths and fails.

auto-upadate feature will now reset the epoch so that if a user doesn't say yes, it won't ask them again for a while. fixes #1240

Fix finding git issue. http://stackoverflow.com/questions/592620/check-if-a-program-exists-from-a-bash-script

update.sh is an "sh" script, not a zsh or bash script. On platforms
which have real sh, echo does not have the -e option.

Fixes #549. Specify ZSH=$ZSH explicitly when invoking
the auto update scripts.

Make tools/install.sh and tools/upgrade.sh pretty.

Paramater substitution instead of command subsitution was being used
causing the calculation of time since last check to be incorrect.

Updating check_for_upgrade script to fix issue when the LAST_EPOCH file/value got corrupted. Closes #32