* add and consistently use parseDate and renderDateBadge helpers
also move
- age
- formatDate
- formatRelativeDate
to date.js
* fix bug in wordpress last update badge
* validate in formatDate() and age()
it is going to be unlikely we'll invoke either of these
directly now, but lets calidate here too
* remove unusued imports
* reverse colours for galaxy toolshed
* 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
