Fix a few more spellos.
Fix help text for Catalog search.
Fix additional typo identified by Phil Klinefelter

See https://github.com/codice/ddf/pull/15#commitcomment-3640160
DDF-79: merged with latest master
DDF-78: Submitted on behalf of a third-party: Brad Hards. Merge branch 'master' of http://github.com/codice/ddf into bradh-master