custom synth should accept collection names

[mtholder]

or lower-case the user input, if we lower-case the "name" field when saving.

See https://github.com/OpenTreeOfLife/collections-1/blob/master/collections-by-owner/snacktavish/woodpeckers.json

Which has the "name" field listed as "Woodpeckers"

[jimallman]

If this follows the id conventions used for tree collections, the appropriate conversion is probably to a "web slug" (hyphens and lower case, with special characters removed). Currently used slugify methods in OpenTree:

• Javascript in curation-helpers.js

• Python in peyotl.utility.str_util

• Python in peyutil.str_util