Add coverage via istanbul
Begin improving test coverage

This also fixes #1425 (which was pretty obvious once it was covered by a
test case) and adds some more constant detection
Merge pull request #1427 from visionmedia/coverage

Coverage
Improve test coverage
Run code coverage automatically on npm test
Merge pull request #1431 from visionmedia/more-coverage

More coverage
Release 1.2.0
fix typo
Merge pull request #1436 from shinnn/master

fix typo
The Forgotten Typo
Merge pull request #1437 from Nami-Doc/patch-1

The Forgotten Typo
More testing and a better warning for tags with multiple attributes
Merge pull request #1439 from visionmedia/more-tests

More testing and a better warning for tags with multiple attributes
Deprecate `node.clone` and `block.replace`
Deprecate removeAttribute/getAttribute
Update with, making options.globals redundant

Everything will just implicitly fall back to globals if it's not defined
locally.
Merge pull request #1441 from visionmedia/update-with

Update with, making options.globals redundant
Merge pull request #1440 from visionmedia/deprecate-clone

Deprecate clone
Merge branch 'master' of https://github.com/visionmedia/jade