Merge changes to move server into its own package

[akalinin-stripe]

Notify

r? @richardm-stripe
cc @dcr-stripe @stripe/api-libraries

Summary

Based on the changes from #238 (thank you @Splizard) with conflicts resolved against the master branch.

The original intent was to fix issue #206 and allow running embedded version of the server.
Detailed changes:

• Move server code from main package into /server directory
• Split embedded data generation to embed spec in server directory and certificates only in main directory
• Refactor out global state verbose variable and include it into server, so it does not become part of the API (not sure what to do with Version though, usually it is OK to leave it as it is set by ldflags).

Finally, it looks like it's a lot of changes, but mostly it's shuffling code around to a different package.

Testing

• Unit tests updated
• Ran tests with the current stripe-go repo

[akalinin-stripe]

False positive in golint is catching auto-generated file comment:
sh go list ./... | xargs -I{} -n1 sh -c 'golint -set_exit_status {} || exit 255' /home/travis/gopath/src/github.com/stripe/stripe-mock/server/bindata.go:1:1: package comment should be of the form "Package server ..."

[richardm-stripe]

This all looks good! The only thing is that I think we should remove bindata.go as the path has moved.

[richardm-stripe]

Clarified IRL! I understand the bindata commands now! Good to merge!