Add seajs-log to travis install
resolve to Module.resolve

将 resolve 工具方法抛出，使用者可以根据实际情况进行重写，可用于性能优化等
Merge pull request #821 from lianqin7/master

为性能优化 resolve 提供接口
Update version to 2.1.1
Expose Module.resolve and Module.save for customization
Update cases for recently change
Rebuild packages
Rebuild packages
Do NOT throw error when require(not-exsited-id). fix #824
Rebuild packages
Update util-request.js

update comments for function getCurrentScript
Merge pull request #826 from saiyagg/patch-1

fix comment for extra 'the'
Remove duplicate "the" in comments
Update cases for text plugin
Fix a resolve bug with directory path. fix #839
Rebuild packages
improve comments
Merge pull request #840 from noahlu/master

Improve comments
Rebuild packages
Update cases for flush plugin