Move run spec fakefs cleanup to correct spot.

Wasn't being cleaned up / deactivated for some specs,
which could leak fakefs activation into other specs
depending on order.
Reset MetricFu after each spec.

Class variable settings were leaking into
other specs and wreaking all sorts of havoc.
Update stubbed methods related to open in browser
Fix broken link to the Reek page.

The previous link does a redirect to a 404.
Merge pull request #116 from calveto/reek-broken-link

Fix broken link to the Reek page.
Add file system stubs for rbx.
Use configure_metrics shortcut.
Fix for undefined json issues in specs.
Merge pull request #115 from robincurry/bug/random-test-order-fixes

Fix tests failing when config.order set to random
Replace rake stats with code_metrics
Stats task no longer depends on rails
correct spec description