New : XXH64, 64-bits version, thanks to Mathias Westerdahl
Added : Travis automated tests

and license
and readme
Fixed : issue 18 (null input pointer)
Changed : API : length uses unsigned int
updated : siphash results
UI : minor : tester indicates 32/64 bits mode
Makefile : added -Wstrict-prototype
Merge pull request #1 from Cyan4973/dev

Dev