preliminary c++11 and libc++ build support

Makefile

@@ -31,7 +31,8 @@
 objects = network_utilities.o sha1.o base64.o md5.o uri.o hybi_header.o data.o
 
 BOOST_LIB_PATH		?= /usr/local/lib
-BOOST_INCLUDE_PATH ?= /usr/local/include
+BOOST_INCLUDE_PATH  ?= /usr/local/include
+CPP11               ?= 
 
 libs = -lboost_system -lboost_date_time -lboost_regex -lboost_random -lboost_program_options
 
@@ -41,7 +42,7 @@ OS=$(shell uname)
 
 # Defaults
 ifeq ($(OS), Darwin)
-	cxxflags_default = -c -Wall -O2 -DNDEBUG -I$(BOOST_INCLUDE_PATH)
+	cxxflags_default = -c $(CPP11) -Wall -O2 -DNDEBUG -I$(BOOST_INCLUDE_PATH)
 else
 	cxxflags_default = -c -Wall -O2 -DNDEBUG -I$(BOOST_INCLUDE_PATH)
 endif