1.0.0
  * Added constant specs (:constantValue=>'val' or :constantValue=>['array', 'of', 'values'])
  * Arbitrarily decided this is version 1.0
0.9.0
  * Added ability to benchmark by calling ss.doc_from_marc(r, true) instead of just ss.doc_from_marc(r)
0.8.1
  * Added some specs, squashed some bugs. In particular, make sure the Range passed to a ControlField
    makes sense (x..y, where x<=y and x > 0)
0.8.0
  * Changed the syntax for a variable field from ['245', '*', '*', 'ab'] to just ['245', 'ab']. We'll worry
    about indicators when that bridge gets crossed.
0.7.3
  * Squashed a bug where I forgot to deal with escaping in java .properties files. Now I'm just using 
    a real Java Properties object so I don't have to worry about it.
0.7.2
  * Also change methodArgs to functionArgs
0.7.1
  * Forgot to update this CHANGES file.     
0.7.0
  * Change configuration for custom functions to use :functionSymbol instead of :methodSymbol. Because, you know, they're
    module functions, not class methods. 
  * Split out marcspec stuff into multiple files (leader/control/variable fields).
0.6.0
  * Allow custom functions to return values for multiple solr fields at once; should help avoid duplication of work.
0.5.0
  * Allow solr field names to repeat in a spec set. This allows you to cumulatively add to a solr field based on "regular" 
    and custom (or, say, two custom) specs.
0.4.0
  * MAJOR BACKWARD-INCOMPATIBLE CHANGE!! The signature for custom routines is now def function(doc, record, my, args), where
  "doc" is a hashlike (usually a SolrDocument) that contains all the work that has happened up to this point. The idea is that you 
  can use previously-computed values to determine values for different fields. Use sparingly.
0.3.0
  * Changed behavior with respect to repeated subfields. A spec such as '260 ac' returns the values of the 'a' and
  'c' subfields concatenated together. A request for '631 z' would, similarly, return the values *of all the subfield
  z's* concatenated together. I'm now treating this as a special case. If the request is for a single subfield code,
  multiple values are returned separate from each other.
  
0.2.0
  * First public release