fixed #92 : add error page

1. add error page(site_home layout and project_home layout)
2. modify Global error handling
modify error page message
replace forbidden view

1. modify error template
2. replace forbidden view in Controller
remove unauthorized error template
replace notfound/badrequest view
change Play mode checking
change default notfound parameter

1. change notfound parameter
2. add milestone notfound checking
3. modify post access checking
change internalServerError message
add error view wrapper and applied
rename error view
pullrequest: fixed #365
doesn't delete clone directory
menu: change project menu style

- make menu font small
- change badge color

and so on..
grouping: remember selected tab and change days ago input style
issue: fix #374
grouping: feature enhancements

- show only member project not own
- default sorting is by pushed date
- show counter at tab
- days ago input style javascript code refactoring
pullrequest: update pull request list view
project-menu: change project menu style
Merge pull request #341 from wansoon/issue

에러페이지 추가 - badrequest, forbidden, unauthorized
fixed #376