minor
new xref function
removed backslash of single quotes
Merge pull request #21 from dklassen/upstream

removed backslash of single quotes
added url and identifiers.org namespace for wormbase
Merge pull request #22 from JuanCifuentes/master

Add additional detail to wormbase namespace
new additions
added file check
added log level control issue #23
Merge remote-tracking branch 'origin/master'