fix file api issue when compile using gcc toolchain
Merge pull request #49 from nodemcu/dev094

fix file api issue when compile using gcc toolchain
fix a bug when readline from uart
Merge pull request #51 from nodemcu/dev094

fix a bug when readline from uart
build latest firmware, add pre_build/latest folder
build latest firmware, add pre_build/latest folder
Merge branch 'master' into benno
init