add efficient filesystem handling for guard
Revert "add efficient filesystem handling for guard"

This reverts commit 6ba615c5866021a30d6b2c50ae33044b180dd14b.
Merge branch 'official'
Merge branch 'official'
required input prompt color used red now
apply registration should not send email. #284
fixed rspec error.
Add spec example to cover #299
Merge branch 'bug/299-regex-security-hole'
Merge pull request #298 from saberma/saberma-bug/284-apply-registration-should-not-send-email

只有审核通过后才向用户发送邮件. #284
Merge pull request #296 from ywjno/used_red_color_with_required_abbr

在form中必须输入的项目的符号提示符变成红色
add acts_as_follower gem.
show follow button.
add angularjs-rails gem.
user follow event.
add angular jasmine test.
use codeclimate status image replace logo image
Merge pull request #304 from zlx/patch-1

use codeclimate status image replace logo image
send email to followers when event create.
add follow hint.