Fix build.sh to add m4 directory to aclocal call
Timeout system implemented.

Minor fix to src/Makefile.am: Install riemann/_config.h.

Now passing NULL to timeout argument of send and recv calls blocks
indefinitely. If you want no blocking calls fill both members of
timeval with 0's. Also remember to pass right flags to send recv
calls, see send man page.

Since send and recv behavior changes when passing NULL timeout
argument I change the API version to 3.

This ends the "Feature list" of this lib. Now starts the testing
testing testing phase. :-)