Updated to allow tapping on trails to get their name

Some of the trails don't have a name in the database, so it's not all trails,
but the ones that do, get the pop-up info bubble.

Also did some code factorization to fix a bug that I didn't even realize that I
had.
Resolved the bug where the disc golf icons could be enabled when the paths are not

Now the checkbox item for the icons is grayed out if the disc golf item is not enabled
Merge pull request #39 from agricocb/master

Tappable trails and disc golf filter bug-fix