finds I2C slaves on BUS

Revision:
0:4241a76032ad
diff -r 000000000000 -r 4241a76032ad .gitignore
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Mon Oct 09 09:50:19 2017 +0000
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+.build
+.mbed
+projectfiles
+*.py*