Add error message when port in use

Change-Id: I18b1e65eb88217a40035b765f8daf70e1abd318f
Add pinyin module for normalizing transcriptions

Change-Id: I04b98358a5e985c9fcd2c1311b0f85dc3f47917c
Fix require bug and add better error logging

Change-Id: I14c6a4358cc81e23dc6f2c8a8bff0ada4a432853