Merge branch 'master' of github.com:jbbrokaw/data-structures
Adds bst deletion and tests, updates readme
Refactors code to avoid the terrible 'hasattr' flagging of empty links, adds delete decision-making to help maintain balance
Adds travis testing
Fixes priorityq _compare override
Adds travis status thing to README
Minor clarity/corrections
Merge pull request #9 from jbbrokaw/bst-deletion

Bst deletion