Safe access to console for oldIE

[nason]

A few of our apps using this library get some traffic from IE <= 9. In those browsers, console is undefined unless the developer tools have been opened. Otherwise, an exception is thrown when a console method is invoked.

This passes our use of console through the console lib, which will stub out console methods for us in this situation https://github.com/matthewhudson/console/blob/master/console.js

[coveralls]

Coverage remained the same at 75.221% when pulling cbe313a on safe-console into d62d946 on master.