bugfix to OHToUInt

   - OHToUInt only worked for Pow2(inputs),
   so now we pad out the inputs.
Merge pull request #60 from smirolo/master

fix: compilable verilog test harness
Merge pull request #58 from ccelio/master

bugfix to OHToUInt
fix issue #1 - throws an exception when extracting an out-of-range bit
fix issue #4 - added warnings for out-of-bounds reads and writes to mem_t instances
added unit test for issue #6