[continuecomment addon] Continue blocks only if mode has blockCommentContinue

Changes in https://github.com/marijnh/CodeMirror/pull/1731 are missing.
[css mode] Added keep-all to valueKeywords. Valid value of e.g. word-break
[project page] Clarify sentence
[javascript mode] Improve number tokenizing

A leading minus isn't part of the number token, but numbers can
start with a dot, which wasn't handled before.

Closes #1753
[erlang-mode] Improvements
Fix another problem caused by the hack for #1474
[the-matrix theme] Add
[the-matrix theme] Integrate
Fix windows detection
[css mode] Add flow-from and flow-into properties
Some small editing corrections in the manual
[fullscreen addon] Add
[fullscreen addon] Restore width and height when leaving fullscreen

Issue #1761
[fullscreen addon] Fix wrong variable/property name

Issue #1761
Check if "cur" is null in patchDisplay()
[bidi demo] Turn off line wrapping, add note about bug
Mark release 3.16.0
Bump version number post-3.16
Also update version number on project page

I really should automate this.
[merge addon] Add highlightDifferences option and method

Provides new option (highlightDifferences) and method highlightDifferences(bool)
to the MergeView plugin.

If true (or undefined) the original behaviour is maintained, which is to show
the differences (line highlighting and gutter graphics), if false then
the changes will not be shown.

Calling the method causes the visual change to occur 'immediately'

Signed-off-by: ciaranj <ciaranj@gmail.com>