bootstrap
plug conditional to warn on upgrading git
Merge pull request #292 from cordoval/292-pull-create-fails-when-using-an-older-git-version

merge #292 pull:create fails when using an older git version (cordoval)

This PR was merged into gushphp:master branch.

Discussion
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Since the resent change with getting the default title for the PR it fails on my system.
It seems `fork-point` was introduced in git 1.9 / 2.0 and does not exist in the version I'm using `1.8.4.msysgit.0`.

I can upgrade this version, but I'm not sure which Git version is provided with most Unix-type systems.
So should warn the user if the Git-version is to low or disable this behavior for such cases?

Commits
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860cc1de5bbb3bcf1bfc675bd2ddaccc1c0ffaea bootstrap (cordoval)
72787edb2c29c327856aa70c2459d6128cf3ffc6 plug conditional to warn on upgrading git (cordoval)