Add facade for getByCriteria method
Add color console output for test script
Prevent double initialization for gh-api.js module
Prevent multiple initialization for src/level-db.js module
Add deep-extend dependency to package.json
Remove some unused modules
Update model files. Move docs meta model to separate module. Simplify logic for library dynamic nodes
Move sync logic to synchronizers
Implement command-line launch ability for sync
Add missed lodash dependency into src/util.js module
Change default language property in configuration file
Change updater.js module according to code refactoring