added node.readvdd33() API [by alonewolfx2](https://github.com/alonewolfx2).<br/>
build pre_build bin.
2015-01-24<br/>
migrate to sdk 0.9.5 release.<br/>
tmr.time() now return second(not precise yet). <br/>
build pre_build bin.
2015-01-23<br/>
merge mqtt branch to master.<br/>
build pre_build bin.
2015-01-18<br/>
merge mqtt module to [new branch mqtt](https://github.com/nodemcu/nodemcu-firmware/tree/mqtt) from [https://github.com/tuanpmt/esp_mqtt](https://github.com/tuanpmt/esp_mqtt).<br/>
merge spi module from iabdalkader:spi. <br/>
fix #110,set local port to random in client mode.<br/>
modify gpio.read to NOT set pin to input mode automatic.<br/>
add PATH env with C:\MinGW\bin;C:\MinGW\msys\1.0\bin;C:\Python27 in eclipse project. resolve #103.
2015-01-08<br/>
fix net.socket:send() issue when multi sends are called. <br/>
*NOTE*: if data length is bigger than 1460, send next packet AFTER "sent" callback is called.<br/>
fix file.read() api, take 0xFF as a regular byte, not EOF.<br/>
pre_build/latest/nodemcu_512k_latest.bin is removed. use pre_build/latest/nodemcu_latest.bin instead.