new parser for cr_works output to get a flat data.frame
slight change to cr_GET helper fxn to optionally parse to data.frame
added rhistory file to gitignore
fixed date parsing in cr_works to only get date, leaving out timestamp filed
updated man pages for works members and fundref fxns
fixed bug in cr_r from change to how cr_works outputs data
updated man files for three fxns
added cr_journals fxn, closes #25