This commit was supposed to hit a branch. Bad git skills.

This reverts commit 68767660c6610fc4c023c4bbac3835fab1909325.
make isMaster lockType NONE to prevent deadlock with relinquish, fixes #261
Merge branch 'bugfix/261'
Add StringData::rfind(char) const method.
took StringData::find changes from commit fd1bc48, refs #259

(SERVER-5710 Changed KeyPattern.hasField() sematics to consider dotted
 field prefixes.)
use StringData in a bunch of places, around NamespaceDetails and NamespaceIndex #259
remove dead code
Merge branch 'master' into cleanup