Initial commit.

* Readme
* gitignore
Create youku_pull.
Add remove_G620_junk.
Rename to ssa.
Add git-aid, argument test.
Complete main logic.
Complete clone step.
Make tracking branches.
Fix bug 'unable-to-use-xxx.git-as-reponame'.
Fix bug 'unable-to-get-repo-from-all'.
Complete push step.
Improve output.
Merge branch 'git_add'
Fix the bug.
Merge branch 'hotfix-git_add-no-push'
Create S7568 junk remove util.

Based on G620 junk remove.