Handle extract errors, Pass solr errors/codes through wm, add error test
Merge branch 'master' into make-doc-err-handle2

Conflicts:
	src/yz_wm_search.erl

A conflict was caused by the insufficient vnode change.
Enable yokozuna for error test
Fix log level and add stack traces
More error logging, remove stored from err field xpath
Merge pull request #112 from basho/make-doc-err-handle2

Handle Errors in a more reasonable manner.