Fix documents.

Add node.restore() to restore Wi-Fi.
Changed wifi.startsmart, see also https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en#wifistartsmart.

fixed ap/station-ap cannot connect to the device.

added wifi.ap.getconfig().
fixed net.dns.getdnsserver().
added new base64 lua example.
added node.bootreason() to inspect boot cause.
optimization of u8g.

Johny Mattsson's commit almost doubling the available Lua heap.

bump to 0.9.6

update mqtt, see readme.md

quick fix cjson.encode

add cjson module

add interger version, fix nodemcu#234, nodemcu#252, nodemcu#246

fix from pellepl/spiffs

dev branch build 20150310