Add Processor class.
Add support for array HashedArg in hash_make.

Move InputPort, OutputPort, and Processor from core/ to network/ directory.
Add Interpolate class and couple basic tests for .interpolate_linear.
Add CircularBuffer class and a good number of tests. More tests still needed though.
Add #to_ary and #push_ary to CircularBuffer, and tests to go with.
Add DelayLine class and test.
Improve HashMake by setting instance variables directly instead of requiring that an accessor method be implemented.