code review; cleanup
add a stub for build config; remove executable from main config
disable main app module
update local underscore utils:
- bind context for delayed/deferred functions;
- allow for zipObj to accept unlimited arguments count;
update BaseCollection: move mergeClientAttr logic from parse to separate method, to allow easily to override parse
update BaseModel: override 'save' method to trigger 'save' event when sync completed
update BaseView: add defaultModel/defaultCollection properties
fix view bindings/validation mixins: allow to read config when 'options' defined as function also
fix ModelBinder extension: restore ability to define binding as just single selector string
update ModelBinder: replace '!bindings' with '_.isEmpty(bindings)'
fix errors in Schema: fix nested attributes reading in base setter; ensure converting undefined to null