Add edge case scenarios which test behavior of mc/cycle-forward and mc/cycle-backward
Fix cycle-cursor behavior.

mc/cycle-forward had been skipping a cursor on (point-max).
mc/cycle-backward had been skipping a cursor on (point-min).
Merge pull request #125 from kyanagi/fix-cycle-cursors-on-edge

Fix cycle-cursor behavior
Fix typo in readme

`mc/pop-mark` should be `mc/mark-pop`.
Merge pull request #129 from jistr/readme_typo

Fix typo in readme