Add test_jk_selection
Disable test_jk_selection in a correct way

libchewing is currently buggy in this case, so it is disabled now.
Add section `Build on OS X` to README.md
Merge pull request #150 from StanleyDing/master

Add section `Build on OS X` to README.md
Add 饢

See [0]. The bopomofo for 饢 is ㄋㄤˊ or ㄋㄤˇ.

[0] http://www.cns11643.gov.tw/AIDB/query_general_view.do?page=e&code=6d79

Closed #151
Improve code readability.
Merge pull request #152 from StanleyDing/master

Improve code readability.