Merge branch 'master' into chore-bump

README.md

@@ -180,6 +180,9 @@ For Mac OS X with [Homebrew](http://brew.sh/):
 - `brew install imagemagick`
 - `brew install graphicsmagick`
 - `brew install ghostscript`
+- You may need to install the Ghostscript fonts manually:
+ - Download the tarball from the [gs-fonts project](https://sourceforge.net/projects/gs-fonts)
+ - `mkdir -p /usr/local/share/ghostscript && tar zxvf /path/to/ghostscript-fonts.tar.gz -C /usr/local/share/ghostscript`
 
 For Debian Linux:
 

src/operator/do.ts

@@ -48,7 +48,7 @@ import { TeardownLogic } from '../Subscription';
  * @owner Observable
  */
 /* tslint:disable:max-line-length */
-export function _do<T>(next: (x: T) => void, error?: (e: any) => void, complete?: (this: Observable<T>) => void): Observable<T>;
+export function _do<T>(this: Observable<T>, next: (x: T) => void, error?: (e: any) => void, complete?: () => void): Observable<T>;
 export function _do<T>(this: Observable<T>, observer: PartialObserver<T>): Observable<T>;
 /* tslint:disable:max-line-length */
 export function _do<T>(this: Observable<T>, nextOrObserver?: PartialObserver<T> | ((x: T) => void),