Updates to recode endpoint

The recode endpoint had changes which are reflected in #44

• siteRecode().version() was removed

• siteRecode().algorithms() returns all the supported algorithms and their versions

• siteRecode().siteGroup() was modified. It now takes 4 parameters. Note that behavior is not used for the seer algorithms and null can be passed in for that case.

  SiteRecode siteGroup(String algorithm, String site, String hist, String behavior);