Honor hooksPath setting in local .git/config

[svoop]

The prepare-commit-msg script is only taken into account if it is located in the default location .git/hooks/

However, a common pattern for projects to enforce commit message consistency is to commit a hooks directory such as lib/git/hooks to the project repo and then include the following somewhere in the clone instructions, a Rake task or similar:

git config core.hooksPath lib/git/hooks

This setting is apparently ignored by fork.

How about a quick git config get core.hooksPath instead of hardcoding the default path?

(This is somewhat related to #1749 and maybe #1789 in the sense that Fork should ideally use hook scripts the same way as the git CLI does to prevent surprising behavior.)