SERVER-15948 Fix tests inserting duplicate ts's into oplog
SERVER-15948 Fast OplogStart impl for RSs supporting arbitrary DiskLocs

Storage engines must opt-in to this functionality. For now, heap1 is the only
one to do so.
SERVER-15665 MMAP v1 requests yields during page faults via NEED_FETCH
SERVER-15948 add missing files
Merge branch 'master' into wt_merge
Fast OplogScan impl for wiredtiger