Fix HTP_HOST_AMBIGUOUS false positive, by not checking for differences when one of the port values is not available. It's not the real fix, but it will do for now, until we determine if these checks add any value at all.
Fixed gtest not compiling on OS X 10.9.
Typo.
Tidy up test.
Updates for 0.5.9.
Merge tag '0.5.9'