Allow commits to be created without index#63

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FrozenCow wants to merge 8 commits intolibgit2:masterfrom

FrozenCow:master

Commits on Aug 19, 2013

Commits on Aug 20, 2013

Updated documentation to match createCommit, createTree and createBlob.
FrozenCow
committed

Commits on Aug 23, 2013

Added createBlobFromDisk, createTree and createCommit to gitteh.coffee
FrozenCow
committed

Commits on Aug 29, 2013