Authenticated get searchable notes

[buckbaskin]

Parent: #4

get searchable notes (atoken, list of <note id>, options)

Options:

• delimiter: delimiter string
• as list: returns a list instead of delimited string
• tokens: returns as a dict of tokens, with their count
  Returns a space delimited version of the note that is designed to be indexed or searched on the client. This can be converted to a list of tokens by spliting on the spaces.