Updated binary.py for support of signed value types.
Added invert and python slice to BinaryValue
Added AD9361 interface driver
Added AXI4 Slave model.
Merge branch 'master' of https://github.com/SnookEE/cocotb into for_chris
Merge pull request #157 from SnookEE/for_chris

Merge of work from @SnookEE