Replace Verilog demo code with something that's not GPL-ed

Closes #1292
Try to make page-up + page-down place the cursor back in its old place

Closes #1291
Add leaveSubmitMethodAlone option to disable form submit hack
[gfm] Add support for task lists.

Closes #1165.
[markdown] Fix list highlighting.

Previously, lists following other content weren't always highlighted.
Mode tcl added.
Added mirc mode.
[mirc mode] Integrate.
[tcl mode] Integrate
Added delmarks command to vim key bindings.

Functionality and error messages match the latest vim 7.0 release.
Replaced builtins with updated list for 1.4. Generated by:
(->> 'clojure.core ns-publics (map first) sort (clojure.string/join " "))