merge new contributors
async: Corrected APIs from forEach* to each*
comments enhanced to jsDoc format
d3: Typed Scale interface to remove duplicate code
Merge pull request #2637 from Penryn/master

async: Corrected APIs from forEach* to each*
Merge pull request #2639 from Evgenus/bigint

BigInt: comments enhanced to jsDoc format
Added property upgradeReq
Merge pull request #2641 from akanehara/add-ws-upgradereq

Added  `upgradeReq` property of `WebSocket`
fix -test.ts to -tests.ts
[Leaflet] Optional context argument in L.DomEvent.removeListener
[Leaflet] on and off alias for L.DomEvent
Merge pull request #2642 from yellowiscool/master

[Leaflet] Small changes on L.DomEvent
Rename htmlparser2tests.ts to htmlparser2-tests.ts
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'origin/master'
missing Promise.nodeify() added
Color.brighter has an optional number parameter
fix htmlparser tests
add Q.delay(ms: number)
d3: Changed Scale names for consistency