Update rx.d.ts
Merge pull request #381 from danko-d/patch-1

Update rx.d.ts
Added reference to rx.coincidence-lite.d.ts in NuGet spec file for RxJS-Coincidence (fixes #382).
Fixed fix of RxJS-Coincidence .nuspec file.
`rx.all.d.ts` file was moved to `ts` folder and added to `RxJs-All` NuGet package.
Merge pull request #383 from Igorbek/nuget-fix

Fixing #382
Merge pull request #384 from Igorbek/ts

Fixing rx.all.d.ts
Rename flatpmapobserver.md to flatmapobserver.md

Observable documentation points at non existing file.
Merge pull request #385 from mathbruyen/patch-1

Rename flatpmapobserver.md to flatmapobserver.md
Documentation for Observable.prototype.pairwise
maxConcurrent parameter of merge is a number
Merge pull request #397 from mathbruyen/patch-1

maxConcurrent parameter of merge is a number
Merge pull request #396 from mathbruyen/pairwise_doc

Documentation for Observable.prototype.pairwise
add RXJS book
Merge pull request #400 from safareli/patch-1

add RXJS book
Fixing Issue #399
Fixing Issue #401
Fixing Issue #402
Fixing Issue #398
Closing Issue #394