update concat-map and tape

concat-map v0.0.1 supports IE6-8.

https://github.com/substack/node-concat-map/commit/27b9a4a19eb2c3501bc40
b633d54a8e99c08765b
use svg badge instead of png badge

SVG badges look beautiful on retina displays.
Merge pull request #4 from shinnn/master

Bump deps