added hamcrest dependency
Updated CommonDataStructures class - added possible LD content types and
now hashmap stores URIProfiles rather than true/false. URIProfiles gives
us more detail on each dataset URI
Created HTTPConnector class, which makes a connection to URLs. The
methods created allow for content negotiation and the ability to parse
the URL for structured data, required for some availability metrics.
There is also a method which checks if a URI is a valid URL.
added test for HTTPConnector
added URIProfile quality report for computed URI's in dereferencibility
and unstructured data
fixed classed to reflect LOD best practices. Please Note, test classes
were not updated