Merge pull request #2 from duanhp/master

数据库表修改
Merge pull request #2 from duanhp/master

数据库表修改
公共单元
Merge branch 'master' of https://github.com/mawb/EnglishPlus-1
Merge pull request #11 from mawb/master

代码合并
词根表，增加字段L_ID,词根名称和序号建立唯一性。
Merge pull request #5 from duanhp/master

数据库表修改和代码