Fix invalid viewport meta

Using ; to separate viewport meta contents will generate the following
error:

Viewport argument value "device-width;" for key "width" not recognized.
Content ignored.

Use , instead fixes that:
http://royaltutorials.com/viewport-argument-value-device-width-for-key-width-not-recognized-content-ignored/
Fix loading moment.min.js from non-root path

Site deployed at directories like /blog/ can't load moment.min.js
properly because twitter.js always expect to load it from /js,
should use config.root/js instead.
Merge pull request #5 from jjgod/e016cdb51b1ccbfd6a32814211fde36d14eadc3d

Fix meta viewport warnings
Merge pull request #6 from jjgod/master

Fix loading moment.min.js from non-root path
Show site logo with favicon.png
Merge pull request #7 from icocoa/master

Show site logo with favicon.png
Merge remote-tracking branch 'tommy/master'