* Handle objs in Ruby code
* Add task to make Makefile
* Share commont constance in test suites
* Add model-related APIs
* Add Whisper::Model class
* Add tests for Whisper::Model
* Add missing LDFLAG -lstdc++
* Add tests for Whisper.log_set
* Add Whisper.set_log
* Define log level
* Add document on logging
* Add license section to README
* Add document on Whisper::Model
* Fix examples in README
* Add test for Model with GC
* Make dependency on Makefile more accurate
* Fix bug about Whisper::Model and GC
