Clean up Autotools related files and rpm spec file.

Clean up Autotools related files and rpm spec file.

 * Add configure.ac instead of configure.in.  New configure script will
   check whether boost library and header files are installed.
 * Change all Makefile.am to respect variables and many targets
   in Autotools-generating Makefile.
 * Change ultramonkeyl7.spec.in to suit new build/install style.
 * Change $(top_srcdir)/Makefile.am to install README into %(docdir).

Note: To build this package, follow these steps.
 1 Install automake, autoconf, libtool and other software required by
   UltraMonkey-L7.
 2 Checkout from git repository.
   % git clone <repository>
 3 Generate configure script, Makefile.in and other files.
   % cd ultramonkey-l7-v2
   % autoreconf -if
 4 Build
   % ./configure	[*]
   % make
 5 Install
   % make install

 [*] You should specify following options to install as previous releases.
   % ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var \
		--libdir='${prefix}/lib64'