Merge pull request #4 from jescarri/master

FIXED/DHT Init sequence, per DHT Arduino Library delay after INIT should be 40ms and PIN should go to INPUT

Recommendation of the minimized version

Minified version of dht22.lua

Delete dht22_min.lua

Minimized version of dht22.lua

Update dht22.lua

Update README.md

Update README.md

Add support for NodeMCU with float point in the example

Support for versions of NodeMCU with float point

Error checking added in the example

Functions description added

Turn some variables to local

Various fixes