Update installation commands

You have to `npm install` in order to grab the npm dependencies.
`git co` alias does not exist by default. Using `git checkout` instead
fixes #178: support cluster and child_process.fork simultaneously

related: jashkenas/coffee-script#2739
disable cluster tests for node <0.10.0
fixes #247: bring back standalone @ ... WARNING: do not use standalone @
change double quotes to single quotes in test/operators.coffee
fixes #242: clean up regexp-distinguishing logic in preprocessor
hopefully the final regex disambiguation; make sure a closing / exists
remove unnecessary label
changes parser so that 'class' can be an object key (which is common in backbone.js apps)
adds tests for objects with keys named 'class'
fixes #258
fixes #259
Merge pull request #260 from logicmason/master

changes parser so that 'class' can be an object key
merged in latest csr