Added dogpile support
    Refactored throughout so that new search engines can be added with minimal change of the core code.
    Refactoring allows us to perform further searches on output (email search on domains found through TLD enumeration?)
    Explicit XML output with filename (-o X parameters)
    Explicit HTML output with filename (-o H parameters)
    HTML/XML now include more data
    Shodan search returns the time the data was updated. This is especially useful when it returns multiple results for the same host/port that were scanned several time.
    Fixed some bugs/irregularities in the DNS Lookup
    Exalead and Yandex are faulty and have been commented out (see engine_list in theharvester.py)
    Improved LinkedIn? support - pulls more back without sacrificing accuracy. Note that some 'none people' links come back as well, but that was an issue with the original.
    Handles non-ASCII characters correctly, and therefore writes valid XML using lxml.