Merge pull request #15 from sgillies/master

Note CRS other than CRS84 are not recommended.
Put current directory on the path.

For use of a local, uninstalled pandoc2rfc.
Remove extra IANA section.

Caught by @adoyle #14.
extra and
Merge pull request #16 from sheppard/patch-1

Remove redundant "and."
how to use default crs
case for SHOULD
Merge pull request #17 from sheppard/patch-1

how to use default crs
Follow up after #17.

Recommed omitting CRS objects over adding the equivalent named
CRS.
Merge branch 'master' of github.com:sgillies/draft-geojson