Fix console plugin circular dep causing bad CDN build

[benvinegar]

So ... including plugins/console.js into raven.js was a bad idea. It created a circular dependency where console.js => singleton.js => raven.js => console.js (and so on) ... causing the CDN build to error because of the way plugins are auto-initialized.

My solution is to create a new file src/console.js and utility method wrapMethod that is shared by both raven.js and plugins/console.js. No more circular dependency, no more tears, and the CDN version now builds fine.

There were already unit + integration tests for the console plugin and console breadcrumbs, and everything seems green.

Will cut 3.0.1 after this lands.

cc @mitsuhiko @mattrobenolt

[mitsuhiko]

Nothing bad sticks out but I'm also not particularly familiar with how we include the plugins.