Merge pull request #253 from breyed/spelling

fixed spelling, including "experimental" in API

examples/echo_server/SConscript

@@ -12,7 +12,7 @@ env_cpp11 = env_cpp11.Clone ()
 
 prgs = []
 
-# if a C++11 environment is avaliable build using that, otherwise use boost
+# if a C++11 environment is available build using that, otherwise use boost
 if env_cpp11.has_key('WSPP_CPP11_ENABLED'):
    ALL_LIBS = boostlibs(['system'],env_cpp11) + [platform_libs] + [polyfill_libs]
    prgs += env_cpp11.Program('echo_server', ["echo_server.cpp"], LIBS = ALL_LIBS)