autogen.sh assumes git clone

[x42]

# get and unzip tar-ball from github
./autogen.sh
[...]
Installing git pre-commit hook for this project.
 ./autogen.sh: line 155: .git/hooks/pre-commit: No such file or directory
 chmod: impossibile accedere a `.git/hooks/pre-commit': No such file or  directory

suggest to add if test -d .git; then .. around the pre-commit hook installer.

[erikd]

@x42 Would be really nice if you could submit a pull request for this.

[x42]

I did not write a patch, so there's nothing to pull from :)

[x42]

done pull-request #7