updated README.md to include all MSCMoreOptionTableViewCellDelegate optional methods
fixes #19 after its changes were lost in the recent commits.

#19 - Hide "More" button when title is nil, empty, or whitespace
all delegate methods have now been made optinal since the more button title is as well, README.md also updated
Merge pull request #21 from lmjabreu/making_all_delegate_methods_optional
Finalizing logic for hiding "More" button