title: I need the Lua math library in NodeMCU
body: <p>I need to perform log calculations for a thermistor, however the Lua math library (<code>math.log</code>) doesn't seem to be implemented, or I'm doing something wrong. It's not a module on NodeMCU-build.com or in the docs, either.</p>
  
  <p>Any ideas/suggestions/solutions?</p>