Merge pull request #94 from appleboy/patch

change listen port from 3000 to 3333 depend on README.
Typo
Update talk.md

Add missing entry for 5/20.
Merge pull request #95 from nchild/patch-1

Update talk.md
Update media.md
Update media.md
Update media.md
use gulp-open
detect os platform
use gulp-plumber for error handling
Merge pull request #96 from g0v/open

support automatic open browser and error handling
add default browser for Linux platform

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>