Add logFunction option

Can pass in a function to override default rollbar.js behavior and
instead pass payload to this logFunction instead of over the network to
Rollbar
Add logToConsole option

Uses window.console.log if defined to route payloads to that function,
using this.options.logFunction.
Merge branch 'master' into logToConsole

Conflicts:
	dist/rollbar.amd.min.js
	dist/rollbar.commonjs.min.js
	dist/rollbar.min.js
	dist/rollbar.shim.min.js
	dist/rollbar.snippet.min.js
Update README
Add dem spaces
Change spaces
Execute logFunction directly. Reset console.log in test.
Add 'verbose' and 'enabled' options. Update README.
Merge remote-tracking branch 'rollbar/master' into logToConsole

Conflicts:
	dist/rollbar.amd.js
	dist/rollbar.amd.min.js
	dist/rollbar.commonjs.js
	dist/rollbar.commonjs.min.js
	dist/rollbar.js
	dist/rollbar.min.js
	src/notifier.js
Clean test spies
Remove redundant console.log spec
Merge pull request #42 from cfurrow/logToConsole

Add logToConsole option, and logFunction option