Add BBSLogger

Closed #6
Define BBS_LOG_LEVEL_???
Add UAO APIs
Add log for API call
Update test environment
Add valgrind.supp for check library
Update .gitignore
Add test-error to test error handling
Update test suite / test case name
Fix typo
Add Development section in README.md
Add UAO tables
Update README.md
Move cp950 data into data/cp950
Update README.md
Add scripts/uao_table_generator.py
Remove trailing spaces
CR/LF -> LF
Prepare b2u_common, b2u_uao241, b2u_uao250
Support `make check`

Closed #7