Support for LL to DMS

[ventralnet]

Lat/Lng conversion to degrees minutes/seconds would be great. Currently I am using (https://github.com/mapbox/sexagesimal) but it would be great to have this in one library!

[ventralnet]

Hello. I submitted a pull request with support for LL to DMS conversion

[ventralnet]

Once you approve this could you put out a new NPM release? Thanks!