Start a set of C++11 lambda-oriented bindings.

This patch only wraps lo_server and lo_server_thread.
Add a means to bypass LO_MARKER checking if type string ends in "$$".

Although the LO_MARKER trick allows a neat run-time check for
lo_send() argument correctness, sometimes when passing on varargs from
another function it can make things difficult, since it depends on a
macro that appends the LO_MARKER arguments.

For example, in the C++ bindings, we wish to define a function named
"Address::send" which passes its arguments on to
lo_message_add_varargs(), however defining a macro called "send" is
not a good idea.

Without changing the prototype for lo_message_add_varargs(), the only
way to disable this check is by modifying one of its existing
arguments.  Therefore, this patch adds a check for two consecutive '$'
characters in the type string.  If they are found, the LO_MARKER check
is bypassed.

Unfortunately this means that a calling function must supply a copied
and modified type string---in a future version of the API it would be
good to give lo_message_add_varargs() the means to disable this check
explicitly.
Add an Address class
Cast operators to liblo types.
Add a Message class.
Add send_from for lo_message.
Ensure not to initialize std::string results with null.
Get rid of debug messages and fix superclass constructor calls.
Turn on -Werror in CXXFLAGS, and fix a few warnings.
Add a handler type for path+msg.
Add a Blob class.