Merge pull request #9 from jerryneedell/jerryn_issue_8

 fix issue#8 -- RPI  I/O error

Author: makermelissa

adafruit_fram.py

@@ -207,8 +207,8 @@ def __init__(self, i2c_bus, address=0x50, write_protect=False,
         dev_id_addr = 0xF8 >> 1
         read_buf = bytearray(3)
         with i2cdev(i2c_bus, dev_id_addr) as dev_id:
-            dev_id.write(bytearray([(address << 1)]), stop=False)
-            dev_id.readinto(read_buf)
+            dev_id.write_then_readinto(bytearray([(address << 1)]),
+                                       read_buf, stop=False)
         manf_id = (((read_buf[0] << 4) +(read_buf[1] >> 4)))
         prod_id = (((read_buf[1] & 0x0F) << 8) + read_buf[2])
         if (manf_id != _I2C_MANF_ID) and (prod_id != _I2C_PROD_ID):