Fix destroy didn't delete all data in the store
Merge pull request #1 from heroicyang/destroy-completely

Fix destroy didn't delete all data in the store
Merge branch 'master' into develop
0.2.2 released
Merge branch 'develop'
Fix model._store without the correct reference
Merge pull request #2 from heroicyang/develop

Fix model._store without the correct reference
Modify travis.yml
Optimize Query.sort
Merge branch 'feature/sort-index' into develop
Rewrite: Basic CRUD done
Maintain cache for getters, setters, queries and updates
Query, sort (not tested yet)
Hooks. Populations. Add comments.
Database save/load. Remove dependency: fast.js
[test] model, util
[test] query
[test] document
[test] schema types
[test] database