Added a TODO for making use of the extra kwarg for logging calls
Changed over to Markdown format and added a section that covers logging
info. The logging info includes a list of common fields and fields that
should not be used as keywords for logging's "extra" arguments
Changed file ext of psafefe's README since it now uses Markdown
formatting.
Added a search RPC call that can search more than one psafe file at
once. Also changed the single-safe search so that it uses the multi-safe
search rather than have a copy of the code.