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Fixing a few quirks in the latest installer updates (quoting /Users/robbyrussell/.oh-my-zsh and such). Also mentioining our twitter account after install

Revert "Cancel update if the current user doesn't have write permissions for the oh-my-zsh directory."

This reverts commit 152e1e07.

After the upgrade is interesting to know what's new.

Although the zshrc template adds a PATH= string, this is overwritten by the installer script.
This allows it to be placed anywhere in the file instead of having to append at the end.

I didn't found the way to right-align the right prompt
properly.
Signed-off-by: Gaetan Semet <gaetan@xeberon.net>

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>

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.