Fix rspec

Signed-off-by: Lennart Fridén <lennart@devl.se>
Add additional development gems.

Signed-off-by: Lennart Fridén <lennart@devl.se>
Move spec_helper

Signed-off-by: Lennart Fridén <lennart@devl.se>
Simplify instructions.

Signed-off-by: Lennart Fridén <lennart@devl.se>
Add some structure

Signed-off-by: Lennart Fridén <lennart@devl.se>
Add ByteRegister

Signed-off-by: Lennart Fridén <lennart@devl.se>