add a new LAMDA parsing utility and add tests for it
add an untested download utility
Merge pull request #404 from keflavich/lamda_utils

Add new LAMDA utilities, including a public parser
rebuild the lamda parser from scratch so that it's robust enough to read
more than one (i.e., all) LAMDA files
Merge pull request #405 from keflavich/lamda_parser_fix

Rebuild LAMDA parser