* Fixes#156: Filter out the video being watched from the list of other videos of the same author;
* Fixes#167: in the video view, hide the author's domain when it's from the current host;
* Fixes#171: Allow undoing a like/dislike;
* Reword documentation;
* Wrap lines at 80 characters in the documentation.
* Wrap CONTRIBUTING.md too;
* Tweaks to CONTRIBUTING.md wording;
* Move development section to CONTRIBUTING.md;
* Explain database creation in CONTRIBUTING.md;