convert value into datatime for fields that have 'date' as type in mappings.json
Merge branch 'rich-data-types-712' of https://github.com/fna/sheer into HEAD
Merge branch 'load-data-from-wordpress-via-json-api' of https://github.com/fna/sheer into HEAD

Conflicts:
	sheer/indexer.py
Merge branch 'master' of github.com:rosskarchner/sheer