Fixes the doctests -- they weren't running in latest rustc
Merge pull request #43 from cgaebel/fix-tests

Fixes the doctests -- they weren't running in latest rustc
correct `IntervalHeap::from_vec`

closes #40
Merge pull request #45 from apasel422/ih

correct `IntervalHeap::from_vec`
Merge branch 'master', remote-tracking branch 'upstream/master' into fix-lru-remove