0.1.1

The following functions now use const for the heap pointer:

void *heap_peek(const heap_t * hp);
int heap_count(const heap_t * hp);
int heap_size(const heap_t * hp);
int heap_contains_item(const heap_t * hp, const void *item);

0.1.0

Merge pull request #6 from njwhite/master

minor elimination of redundant code