Merge pull request #375 from zachary-foster/master

made genbank2uid accept multiple ids
simplified genbank2uid a bit, curl options can now pass in, added vectorized examples ping @zachary-foster #375
added missing rows param and functionality in get_bold_id closes #377
also added missing ... to pass in curl options, almost :chicken: day
started simplifying and fixing up low level itis functions #378
Replace series of if-checks with a switch to make it more extensible and allow for a "default" - namely, the db is not NULL, but also not recognised, which isn't currently handled and so leads to a confusing error (object 'out' not found)
nearly done reworking low level itis fxns #378
Merge pull request #379 from Ironholds/master

patch children.default to make more extensible and the error messages more sensible
merged changes
fixed test
fixes to get_tsn to allow passing in curl options, removed pass on of verbose to internal itis fxns
updated man file
updated man file
simplified internal structure of default children fxn, #379
changed classification db if else to switch to follow children eg
patch version bump
updated date