Ignore the build directory.
If the command response is not a known value, assume it is an integer.

This means that some commands which return a value now work, e.g.:
$ onkyo main.master-volume=query
<eISCP(TX-NR414) 192.168.55.5:60128>: MVLQSTN
('master-volume', 15)

Some other commands continue to fail, such as main.tone-front=query
Fix typos in comments.
Better solution to failed parsing - only return int if it is hex already.
It seems that 0.7 seconds is not generous enough for my NR414 :-(