converting bounding box to EML format
Merge branch 'master' of https://github.com/ropensci/mdextract
finished bounding box fxn
Merge branch 'master' of https://github.com/ropensci/mdextract
Added bounding box example.
Merge pull request #10 from lwinslow-usgs/master

Added bounding box example.
simple convex method. need ordering
poly ring, but order wrong
Added elevation finding functionality
Merge branch 'master' of https://github.com/ropensci/mdextract
Added simple datetime_range function
Merge remote-tracking branch 'upstream/master'
Added clustering to intelligently cluster date/time ranges
Merge pull request #11 from lwinslow-usgs/master

Added clustering to date/time coverage calculation.
ordered lines, need first indx
merge fix
simplify and clean
roxygen
added s4 class definitions
Merge branch 'master' of https://github.com/ropensci/mdextract