tests written, min_heap stubbed
more tests written for private helper functions
find parent and child helper methods pass
fixed test_pop_on_large_heap.  all methods working except pop
not sure test_init_with_unsorted_iterable is correct.  Also pop does not work.  All other tests pass
all tests pass.  finished pop and helper methods _smaller_child and _trickle_down
cleaned up print and debugging junk, added, and edited some comments
little bit more cleanup and comments
Update README.md

changed README to all markdown
Update README.md