Fix for FastForward detach issue + test.#617

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angusbjones wants to merge 3 commits intolibgit2:vNextfrom

angusbjones:FastForward-Merge-Fix-+-Test-Fix

Commits on Jan 30, 2014

Fix for FastForward detach issue + test.
angusbjones
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Added changes given by @nulltoken. Also added similar changes to test for non fast forward.
angusbjones
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Commits on Feb 3, 2014

Added changes given by @jamill
angusbjones
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