update automake so that 'make install' works

  - All header files that are required are installed
    into $includedir/libcuckoo/
    (e.g., /usr/include/libcuckoo or
    	   /usr/local/include/libcuckoo )

  - libcityhash is also installed as for a .a and .so
    library.  Location, as above, depends on how build
    was configured