* add test for imported function
* start to implement import references check
* fix imported function test
* skip alias when looking for symbol target
* recognize ES6 imports
* recognize some export syntax
* add tests for imports/exports
* add test for imported function
* start to implement import references check
* fix imported function test
* skip alias when looking for symbol target
* recognize ES6 imports
* recognize some export syntax
* add tests for imports/exports
* add test for imported function
* start to implement import references check
* fix imported function test
* recognize ES6 imports
* recognize some export syntax
* add mode import/export syntax cases
* fix entryToFunctionCall to deal with new calls through property/element access expressions
* add more tests for imports/exports
* allow function and class declarations that have no name but have a default modifier
* rename tests
* fix conflict
* fix tests
* add test for nameless class
* rename function
* minor refactor
* remove old tests
* delete old test
* refactor as suggested
* use getContainingFunctionDeclaration
