More cast fun.
Two types of data.
Ignore generated Pgtest-Support file.
Merge pull request #591 from PDAL/issues/583-pgpointcloud-ignore

Ignore generated Pgtest-Support file.
Add base64-encoding of header extra data.
Merge pull request #593 from PDAL/cast

Cast
Merge remote-tracking branch 'origin/master' into lasdump
Travis build.