clean  database and remove mongod.lock
 clean  files in database and remove mongod.lock
Merge branch 'master' of github.com:Sue-Yi-FAN/travis-reporter
Merge branch 'master' of github.com:evanxd/travis-reporter
modify db schema and parser.js
Merge pull request #240 from Sue-Yi-FAN/master

modify db schema and parser.js