RevC基板用 VerC1.2 BMP280対応

 * i2c_adr=0x76
 * 気圧の小数点以下を2から3桁に増やした
 * BMP280用のライブラリとしてAdafruit_BMP280を使う
 * BMP280の測定設定
 *  Temp Oversampling x2
 *  Press Oversampling x16
 *  Mode: Forced modeでBMP180と同じ単発測定にする
 *  IIR Filter 16

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#	new file:   Adafruit_BMP280.cpp
#	new file:   Adafruit_BMP280.h
#	deleted:    SFE_BMP180.cpp
#	deleted:    SFE_BMP180.h
#	renamed:    ky_nipr.ino -> kylogC12.ino
#
# Untracked files:
#	.goutputstream-EOLRKX
#
