chalk integration for nicer output.

first external dependency. :( can someone confirm - this is not too heavy.

chalk@0.4.0 node_modules/chalk
├── has-color@0.1.1
├── ansi-styles@1.0.0
└── strip-ansi@0.1.1

Sample output:

FAILED: core - Conditional compilation compatibility (#13274) : No errors
expected: []
actual: Uncaught ReferenceError: QUnit is not defined
Source:
    at http://localhost:8888/test/unit/core.js:1502:2
    at http://localhost:8888/test/data/testinit.js:251:10