clean up Configuration implementation
Update broken README link

* fastly_rails changed to fastly-rails
Merge pull request #1 from harlow/hw-fix-broken-link

Update broken README link
Merge pull request #3 from chaslemley/clean_up_configuration

clean up Configuration implementation
remove unnecessary items in test book model
Merge pull request #4 from fastly/clean-test-model

remove unnecessary items in test book model
Remove unnecessary InstanceMethods module

Stack Overflow has a good explanation of why the InstanceMethods module is
overkill:
http://stackoverflow.com/questions/8706897/why-has-the-instancemethods-module-been-deprecated
Tell people how to install all required gems
Clarify logic around authentication
Merge pull request #5 from gabebw/gbw-remove-unnecessary-module

Remove unnecessary InstanceMethods module
Merge pull request #6 from gabebw/gbw-extract-method

Clarify logic around authentication, and update README re: appraisal install
remove purgeable and fastly dir - not used at all, and not implemented
Merge pull request #8 from fastly/remove-purgeable

remove purgeable and fastly dir - not used at all, and not implemented
Add some more documentation
Use `self.method` instead of `extend self`
Merge pull request #9 from gabebw/gbw-improve-docs

Add some more documentation
Merge pull request #10 from gabebw/gbw-avoid-extend-self

Use `self.method` instead of `extend self`
Clarifies surrogate key definition
Merge pull request #12 from fastly/aspires/readme

Clarify surrogate key definition in readme