tetha -> theta (spelling)
tetha -> theta (spelling)
tetha -> theta (spelling)

I think that's all of them.
Merge pull request #58 from zeffii/patch-1

tetha -> theta (spelling)
Merge pull request #59 from zeffii/patch-2

tetha -> theta (spelling)
Merge pull request #60 from zeffii/patch-3

tetha -> theta (spelling)
Merge pull request #33 from nortikin/master

sync theta