BufferApp OAuth2.

Hello, i submited a pull request in other issue #609, this fix is here.

git ls-files | xargs git update-index --add --chmod=-x
 
git commit -m "Local mode changed" && \
git checkout -- . && \
git rebase -i HEAD~4
 
pick
squash
squash
squash
 
New Commit Message: BufferApp OAuth2.

Thanks.
I removed the mapping for "email" field.