how to construct partial functions
some tweaks
Merge pull request #12 from samuelgruetter/master

How to construct partial functions
Add week 4 (Observables)
Merge pull request #13 from lpoulain/patch-4

Add week 4 (Observables)
Added section about Schedulers (week 4)
Fixed some typos. 

Observablesm -> Observables
BooleanSuscription -> BooleanSubscription
Merge pull request #14 from lpoulain/patch-5

Added section about Schedulers (week 4)
Merge pull request #15 from zeronone/patch-1

Fixed some typos.
Week 4 (actors) + minor Promise definition change

- Adding week 4 (Actors)
- Changed the first paragraph for Promises
Merge pull request #16 from lpoulain/patch-6

Week 4 (actors) + minor Promise definition change
Fix typo

flatMap
Merge pull request #17 from FranklinChen/patch-1

Fix typo
Added week 6 (Actors part 2)

I added the content for week 6, and reorganized a bit the Actors section
Merge pull request #18 from lpoulain/patch-7

Added week 6 (Actors part 2)
Minor updates on Actor

- Edited some sections to make sure that the code gets properly displayed.
- Changed a few things about the postRestart, postStop(), etc. (these are methods and not messages)
Merge pull request #19 from lpoulain/patch-8

Minor updates on Actor
Add link to Scala Cheat Sheet
Merge pull request #20 from longhua/patch-1

Add link to Scala Cheat Sheet