rx.js: updated to version 2.2.13
Update AmCharts.d.ts

Added constructor to AmCharts (for when you construct a chart with a theme)
Added ? to AddLegend optional divElement argument
promises-a-plus: added initial defintions
rx.js: modified IPromise in Async module to match Promises/A+
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	rx.js/rx.d.ts
Merge pull request #1783 from colindembovsky/patch-1

Update AmCharts.d.ts
promises-a-plus: updated tests of compatibility with implementation libraries
Merge branch 'promises-a-plus'
promises-a-plus: fixed Q import casing in tests
Merge pull request #1823 from Igorbek/master

Definitions of spec of Promises/A+; Updated RxJS