[#211]Add hints for email and password in login page and cancle the function of register
	修改：      app/views/account/login.html.erb
	修改：      app/views/shared/_topnav.html.erb
[#973] add tooltip for event
[#973] add tooltip for event
[#1331] After member invitation, the member list refresh. After watched, the watchers list refresh.
[#1601] To refresh right side of the issue page when assigned_to on the left sidebar is updated.
[#970]Integrate the function of inviting member to the whole system
	修改：      app/assets/stylesheets/planners/form.css
	修改：      app/views/planners/projects/_new_member.html.erb
	修改：      app/views/planners/projects/index.html.erb
	修改：      app/views/planners/projects/show.html.erb