Use const auto& for non-pointer types in for each loop
Make classes immutable
Better exception handling in command line tools
Delete .gitmodules
Remove gettext
Fix node binding
Add toplevel Makefile
Update Travis CI configuration
增補6對轉換
TWVariants.txt: 刪去三組非OpenCC標準到臺標的轉換，以防逆向轉錯
新增香港標準字

根據《香港小學學習字詞表》（http://www.edbchinese.hk/lexlist_ch/）及《常用字字形表》（http://input.foruto.com/ccc/gongbiu/dzijingbiu/index.htm）撰寫。
優先以《香港小學學習字詞表》用字爲準。
Merge pull request #69 from kunki/master

新增香港標準字
Fix a build issue of node binding
Update configuration for Travis-CI
Add build script for HK conversions and unit test
Fix a typo in README
Add unit test for C-style interfaces
Sort HKVariantsRevPhrases.txt
Not sort lexicon when loading Darts dictionary

Before this change, the constructor of TextDict sorts lexicon even it is
known sorted. This decreases the loading time of DartsDict.
Make DictEntry immutable