first pass at a certificate store

.travis.yml

README.md

cmd/cashierd/main.go

cmd/dbinit/dbinit.go

example-server.conf

server/certutil/util.go

server/certutil/util_test.go

server/config/config.go

server/signer/signer.go

server/signer/signer_test.go

server/store/mem.go

server/store/mysql.go

server/store/store.go

server/store/store_test.go

vendor/github.com/go-sql-driver/mysql/AUTHORS

vendor/github.com/go-sql-driver/mysql/CHANGELOG.md

vendor/github.com/go-sql-driver/mysql/CONTRIBUTING.md

vendor/github.com/go-sql-driver/mysql/ISSUE_TEMPLATE.md

vendor/github.com/go-sql-driver/mysql/LICENSE

...r/github.com/go-sql-driver/mysql/PULL_REQUEST_TEMPLATE.md