Updating helpers documentation
Merge pull request #202 from staltz/master

Added a tutorial link to readme.md
Updating exclusive/map
Fixing issue #169
Fixed Issue #196
Fixing exclusive/map
Fixing Issue #203
Updating to v2.2.28
Updated TypeScript definition files to sync with v2.2.28.
Merge pull request #207 from Igorbek/ts

Updated TypeScript definition files to sync with v2.2.28
Support objectMode streams in Node.js

Write original object to stream instead of its stringified version. This fixes writing objects to streams created as [Writable({objectMode: true})](http://nodejs.org/api/stream.html#stream_new_stream_writable_options).
Merge pull request #210 from RReverser/patch-1

Support objectMode streams in Node.js
Closing issue #206
Partial fix to Issue #205
Adding more fixes to Issue #205
First commit for Issue #214
Fixing Issue #211 Issue #212 Issue #214
Update observable.md: fixed takeUntilWithTime

Wrong title
Merge pull request #216 from staltz/patch-1

Update observable.md: fixed takeUntilWithTime