Add second SPI port names

Merge pull request #29 from ladyada/master

add support for second SPI - tested!

Add write_then_readinto function for linux

Linux requires a single IOCTL for repeated start i2c calls, we now support it using writeto_then_readfrom()
Also an SPI bugfix

Update to SPI

Allows for MOSI and MISO to be none.

I2C and SPI fixes to bring more in line with busio

Updates to politely cope with strings of bytes and add start/end.

SPI write_readinto

SPI hardware write_readinto working. Tested on MCP3008.

Fix for unsupported boards

Fixes invalid machine import on Travis.

Initial hardware SPI support

SPI hardware write/readinto working - tested with BME280

Add missing Raspi GPIO pins

All GPIO should be there in board now!

Now includes all packages in pypi package

We were missing the raspi version before.

Include micropython module

Also package the micropython module because it includes the const function used in drivers.