Bump version for future development
Add Strutil::starts_with and ends_with, to go with the 'i' versions
SPI builds to use clang-3.4.1
CMake 3.0 compatibility:

CMAKE_CXX_COMPILER_ID may be "AppleClang" rather than "Clang" if it's the
separately versioned Apple variety on OSX. Make the test robust to either
by using MATCHES instead of STREQUAL.
TIF output support of Exif (only available for libtiff >= 4.0.2)

Earlier versions of libtiff (including the version that was current when
we added Exif reading to our tiff support) supported reading Exif, but
not writing Exif. Later versions of libtiff have added this capability.
More work on TIFF output of Exif.
Make TIFF error message storage thread-safe