Added a framework for external source lookup services
Added an IHS lookup service
Added shipExtLookup - a tool to look up ship data in external services
Added a setter for the Source class's IMO property
Added a datasource ALOB property to the edb Source class
Added ireplace() to the tests package for use with assertStreamEqual
Restructured and improved the lookupservices package
- Added a CacheMixin for the fetcher classes to support caching.
Restructured and improved the shipExtLookup tool
Renamed shipExtLookup to sourceLookup
Made BaseHTTPFetcher and XMLParser work with strings instead of streams
Made the lookupservices' FileLikeDataMixin work together with CacheMixin
Merge pull request #3 from dsegerss/topic/shipExtLookup

Source data look-ups in external services.