Remove incompatible Pylint controls (Issue #8)

`#pylint: disable=useless-import-alias` is not supported in Pylint 1.9.2

adafruit_bmp280.py

@@ -171,7 +171,6 @@ class Adafruit_BMP280_I2C(Adafruit_BMP280): # pylint: disable=invalid-name
     """Driver for I2C connected BMP280. Default address is 0x77 but another address can be passed
        in as an argument"""
     def __init__(self, i2c, address=0x77):
-        # pylint: disable=useless-import-alias
         import adafruit_bus_device.i2c_device as i2c_device
         self._i2c = i2c_device.I2CDevice(i2c, address)
         super().__init__()
@@ -195,7 +194,6 @@ class Adafruit_BMP280_SPI(Adafruit_BMP280):
     """Driver for SPI connected BMP280. Default clock rate is 100000 but can be changed with
       'baudrate'"""
     def __init__(self, spi, cs, baudrate=100000):
-        # pylint: disable=useless-import-alias
         import adafruit_bus_device.spi_device as spi_device
         self._spi = spi_device.SPIDevice(spi, cs, baudrate=baudrate)
         super().__init__()