Add BitSet Algorithm for fast search in metadata

Added BenchMark for search

cleaning

cleaning

cleaning

BitSet version

Added Bitset support with lib

added lib for bitset

put back again the right signature for Context

fix correct indexing

Fix BitSet size issue for or, perf improvments

Fix some jshint issues
Added back search by id on Context
Merge pull request #1 from fabricematrat/master

Added BitSet Algorithm for metadata search