Add Florian Forster to hall of fame

Permission recieved from Florian Forster on Jan 07 2013 to include
any changes of his from core Git into LibGit2.
Revert changes from git/git diff-delta.c by dak@gnu.org, proski@gnu.org
Merge pull request #1202 from martinwoodward/add-florian

Add Florian Forster to hall of fame
Merge pull request #1203 from phkelley/reverse_dak

Revert changes from git/git diff-delta.c by dak@gnu.org, proski@gnu.org