Auto refresh is off by default

It causes less performance
Add document
Small refactoring
Run test with rake
Use dot reporter of themis.vim
Add AgitGit Ex-command
Workaround for merge conflict

When merge conflicts, the result of `diff --stat -p --cached` becomes
strange.
This commit deals with that result but can not correctly parse yet.
Update vital.vim
Work well on Windows
Add g:agit_max_log_lines option
Optimize align logic
Redraw when reloaded