Openstreetmap-website: Add 'swap from and to' to directions

[jidanni]

http://www.openstreetmap.org/directions?engine=osrm_car&route=24.16453%2C120.86340%3B24.16506%2C120.86437#m
is great. But they forgot a most basic functionality: swap from and to.

[jidanni]

Using the mouse to cut and paste one into the other... because of some address expansion engine working, results in what was 115 meters becoming 48 meters.
I.e., one cannot do a clean swap via other methods easily.

[jidanni]

The user would probably have to edit the string seen in the URL bar, avoiding the %2C's etc.

[jguthrie100]

I took the opportunity to add a pull request @ #1693

[jidanni]

@jguthrie100 Thanks.

[tomhughes]

This was fixed in #1693.