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
add BinaryValue.signed_integer to allow easier use of signed values
Merge pull request #158 from dlharmon/master

add BinaryValue.signed_integer to allow easier use of signed values
Merge pull request #157 from SnookEE/for_chris

Merge of work from @SnookEE
Cleanup: Tidy-up of new AXI4Slave driver (untested...)
Cleanup: Revert unneccessary change from pull request