* allow serviceData to override cacheSeconds with a longer value
* prevent [endpoint] json cacheSeconds property exceeding service default
* allow ShieldsRuntimeError to specify a cacheSeconds property
By default error responses use the cacheLength of
the service class throwing the error.
This allows error to tell the handling layer the maxAge
that should be set on the error badge response.
* add customExceptions param
This
1. allows us to specify custom properties to pass to the exception
constructor if we throw any of the standard got errors
e.g: `ETIMEDOUT`, `ECONNRESET`, etc
2. uses a custom `cacheSeconds` property (if set on the exception)
to set the response maxAge
* customExceptions --> systemErrors
* errorMessages --> httpErrors
* Subclass factory for JSON path services
* Common methods moved to JSON path class
* should throw error if _getData is not overridden
* Test JSON path factory using chai-as-promised
* Using chai-as-promised in more tests
* JSDoc for json-path
* Error message adopted to JSON and YAML
* Dynamic YAML badge handles YAML with a string
* 'fetch' naming covention
* Strict string validation in error message
