message: Fix typo in documentation
  lastest -> latest
diff: @@ -370,8 +370,8 @@ same version that our continuous builds use.
  cd <your chosen parent folder for the emscripten SDK>
  curl -L https://github.com/emscripten-core/emsdk/archive/1b1f08f.zip > emsdk.zip
  unzip emsdk.zip ; mv emsdk-* emsdk ; cd emsdk
  -./emsdk install lastest
  -./emsdk activate lastest
  +pyton27 ./emsdk.py install latest
  +pyton27 ./emsdk.py activate latest
  source ./emsdk_env.sh
  ```
  