initial modal commit - it works.
modal is styled.
ferry and light-rail stops are marked with a greyed out icon to differentiate them from bus stops.
added favicons, style adjustments.
added apple-specific favicon
added regular favicon
"I understand" --> "I accept"
fixed loading animation issue by position: fixed;
Merge pull request #73 from wbprice/modal-disclaimer

Modal disclaimer.

Closes #67. Closes #45. Closes #23. Closes #61.