Ignore binstubs directory
Move Engine to the Thincloud::Postmark module
Access ENV var in Configuration

Makes the initializer optional. Convention over 
configuration, baby!
Add Rails Dummy application for testing
Provide more configuration options

Move Thincloud::Postmark::Configuration into
the rails application configuration object. The
Engine manages this initial connection and gives
users then ability to use the block syntax or
access the configuration directly through 
`config.thincloud.postmark`.

Integration expectations now test that the 
settings are correctly applied to an application.
Use configuration in Engine init
Provide access to secure setting in config

Defaults to `true` for our normal use case but
allows setting this through the configuration.
Use application block option in initializer
Store secure setting on Postmark class
Clarify configuration testing

Test expectations for Configuration separately
from the integration with the Rails application
config. Each test file is more focused and 
clearer to understand.
Use different hook for action_mailer config

By using the `after: "finisher_hook"` we are 
alleviated from the specific load order of the
initializers. ActionMailer allows the addition
of delivery methods at any point during app
execution as long as it's there before you send
mail.

Now we can lose the specific initializer path
tests, the generated initializer is unneeded
in a standard application, and the app can use
any method to set the configuration during 
initialization and it's picked up at the end.
Add Interceptor 

Working toward not needing the interceptor
initializer in default setups.
Register Interceptor during engine init

Registering the interceptor on engine init allows
for drop-in use of tc-postmark on most projects.
The configuration options for the interceptor
have been pulled up into Configuration with 
sensible defaults based on our usage.
Appease CANE
Use convention in postmark initializer template
Update mail interceptor template
Add cc to interceptor and update expectations
SPAAAAACE
Use array of environments for interceptor

Allow configuration of which environments to
enable the interceptor.
Generators go bye-bye