Splash Page and Melbourne Tram Scraping

Added a splash page to promote the repository.  This will probably be
implemented into the repository gitub "pages" page.

Did a bit more work on the tram scraping for Melbourne.  Indentified a
number of issues relating to exceptions during the scraping process.
Will need to implement fixes.

Updated the .gitignore to hide some large data files.  Furthermore,
changed the README a little bit.