tsl2550: driver for the TSL2550 light sensor

Change-Id: I9e1c87132404509ffec8bf22a8c6cc993df1aa73
sht21: driver for the SHT21 humidity & temp sensor

Change-Id: Ia71168e394a7b260019e74973db6c9d75d3d4482
bmp085: driver for the BMP085 temp&pressure sensor

Change-Id: I5c297a7f4f8cea2549e537df30a5c7bf5b9d8b51
eepromread: add board info for BeagleBone Capes

Capes (i.e. expansion boards for the BeagleBone and BeagleBone Black)
each have their own cat24c256 EEPROM with information about the cape
such as the name of the cape, pins used, power requirements, etc.

This patch adds support for displaying the cape data fields. It
can be used in shell scripts to detect and identify attached capes.

Change-Id: I4bfa7aae634a7bacfa5e25afcba773d9fbc2316c
rc: start drivers for attached BeagleBone Capes

BeagleBone Capes add additional hardware to the BeagleBone to
improve functionality.

This patch probes the third i2c bus for capes and loads the
appropriate drivers for each detected cape. Currently only
the 'BeagleBone Weather' cape is supported.

Change-Id: Id8c133810db6de7c21625c2d5a794b8874673a0f