Version 0.0.3

ChangeLog

• New persistent JSInterpreter object to avoid setup cost when reusing it
• Allow calling Python from JS through call_python  function
• Allow using evaljs on file objects to run them
• Javascript exceptions now provide stactrace
• Support for require() to load modules in Javascript
• Built-in JSX transpiler
• Working react 0.14.8 support
• Support for installing npmjs packages
• Fix memory leak