Merge pull request #300 from Igorbek/ts

Update TypeScript definition
Fixed selectSwitch/flatMapLatest definition (fixes Reactive-Extensions/RxJS#304).
Merge branch 'master' of https://github.com/Igorbek/rx.d.ts into nuget-fix
Merge branch 'master' of https://github.com/Reactive-Extensions/RxJS into nuget-fix
Merge pull request #306 from Igorbek/nuget-fix

TypeScript: fixed selectSwitch/flatMapLatest definition
Renamed `then` to `thenDo` (due RxJS 2.3.12 changes).
Merge branch 'master' of https://github.com/Igorbek/rx.d.ts into ts