Proper version reference for casperjs
Proper version reference for casperjs

Since `~1.1` means “stable versions only” in npm 2.x, package installation is failing as there’s no stable 1.1 version yet, only beta. Sholud fix #66
davidosomething/grunt-casperjs,ronaldlokers/grunt-casperjs,ryanmcdermott/grunt-casperjs