Merge with https://github.com/puppi.
 + Added support +-inf to test.lua
 + Added stream support.
Lua 5.2 compatibility.
 Global variable (cmsgpack) creates only on Lua 5.1
 See test_global
Add. `cmsgpack.safe` module.
  This module do not raise error but just return error code.
  See test_error/test_safe.
Fix. Some arrays do not detect as array.
  See `test_array`.
Add. .travis.yml