v1.1.12 (#14)

1. Improving the usability of the hash heap
2. Fix deque array out of bounds

HashHeap (#13)

* hash heap

Merge pull request #12 from lxzan/dev

simplify segment_tree

Merge branch 'dev'

Merge pull request #11 from lxzan/dev

simplify vector

Merge pull request #10 from lxzan/dev

add groupBy

Merge pull request #9 from lxzan/dev

modify package name

Merge pull request #7 from lxzan/dev

Add Map/Reduce Methods

Merge pull request #6 from lxzan/dev

Adjusting the order of vector generic parameters

Merge pull request #5 from lxzan/dev

add indexed heap impl