Tinkering with install generator
Adding a DOI generator
Processing configuration after load

When I was working to incorporate this into a Rails application the
configuration options were throwing lots of errors related to having
files loaded. The sequence of initializers had become important and
labrythine.

To solve this I am instead capturing the configuration block and
executing it later in the Rails load sequence. There may be some
interesting development behaviors that could occur.

From
http://guides.rubyonrails.org/configuring.html#initialization-events
> to_prepare: Run after the initializers are run for all Railties
> (including the application itself), but before eager loading and
> the middleware stack is built. More importantly, will run upon every
> request in development, but only once (during boot-up) in production
> and test.
Tweaking VCR::SpecSupport to be a method

Instead of requiring merge, convert SpecSupport into a method
Extracting Doi::TEST_CONFIGURATION parameters

I want to reuse these in the generator.
Adding configuration options for DOI generation
Bumping to version 0.4.3