twitter/secureheaders — pull request #92 by oreoshake (2014-06-09 22:22:58+00:00)
Title: Proc support for config values

Allows something like this:

```ruby
csp = {
:default_src => 'self',
:report_uri => lambda {
if FeatureToggle.available?(:new_csp_endpoint)
'//example.com/new_csp'
else
'//example.com/old_csp'
end
}
}
```ruby

(also includes updates to rspec3, removes nonce support, rvm cleanup, etc)

cc @bigloser