Merge pull request #116 from gvol/master

Added mc/edit-lines-empty-lines
Update README with @gvol contribution.
fix compilation warnings (#66)

Fixes #66.
Merge pull request #118 from aspiers/fix-compile-warnings

fix compilation warnings
Show appropriate error messages on trying skipping/unmarking commands with no fake cursors
Merge pull request #122 from kyanagi/appropriate-error-messages-when-no-fake-cursors-exist

Show appropriate error messages on trying skipping/unmarking commands with no fake cursors