Add ability to provide theory-specific proof rules to EqualityEngine, extends enumeration of MergeReasonType.  Add initial use in TheoryArrays.
dos2unix on the proof signatures, and fix the makefile.
SMT-LIB compliance: allow bin/hex set-info, e.g. (set-info :key #xffff).  Thanks to David Cok for the bug report.
hot fix for pre-reg term caching in strings
Merge branch 'master' of github.com:tiliang/CVC4