Merge pull request #2 from stensrud/master

Parse time from track points, if any
build doc with grunt
merge changes
make all times return proper dates
0.4.0
updates to gpx
update readme and doc
0.5.0
Removed missing module.
Fixed xml2js version.
Implemented functionality to load an external gpx file via HTTP(S).
Implemented unit test for checking the HTTP(S) functionality.
Merge pull request #4 from akoenig/feature/http-load

Functionality for parsing external files
re-add lib-cov
0.6.0
doc improvements
Don't crash on xml parser errors or malformed gpx files