Forcedraw

[Zolmeister]

Added optional param to m.redraw(true) to allow forced redrawing, overriding default asyncronicity

This is built off of #197

[lhorie]

The only reservation I have with this PR is that it makes the .then(m.redraw) idiom a bit more expensive in edge cases where two or more requests finish within the span of one frame.

This idiom is useful for showing loading icons, for example.

This can probably be mitigated for 99.9% of the cases by doing a strict comparison (i.e. === true) instead of !force

[lhorie]

Oh, and it's failing the CI build for some reason, which is preventing me from merging it

[Zolmeister]

@lhorie Sent you an email, this PR depends on #197
If you're willing to merge the whole thing, I'll resolve conflicts to let you merge cleanly (let me know)
and also make it === true

[lhorie]

Yep, I saw it. I just added you as collaborator.

It's a bit hard to read the diff, but I think this change can be merged without bringing in #197.