Add show more link for repositories and wiki pages

Fix merge checking

Fix presentation of commit list in the pull request detail view

Merge pull request #886 from noc06140728/fix-octicon ...

Replace some icon to octicon

Fix merge guide to display ssh url

Replace some icon to octicon ...

- replace some of the non-octicon to octicon.
- adjust the color of octicon on the button.

modified icon is as follows.

- .icon-home          -> .octicon-home
- .icon-time          -> .octicon-clock
- .icon-ok            -> .octicon-check
- .icon-lock          -> .octicon-lock
- .icon-envelope      -> .octicon-mail
- .icon-pencil        -> .octicon-pencil
- .icon-remove-circle -> .octicon-x
- .icon-check         -> .octicon-clippy
- .icon-calendar      -> .octicon-calendar
- .icon-cog           -> .octicon-gear
- .icon-th-list       -> .octicon-list-unordered
- .icon-trash         -> .octicon-trashcan
- .icon-arrow-right   -> .octicon-arrow-right
- .icon-retweet       -> .octicon-git-compare
- .icon-comment       -> .octicon-comment

Improve issue and pull request creation form

Updated to fix truncated name in JSON: watchers_coun ...

The correct field in the JSON should be `watchers_count` rather
than the truncated version `watchers_coun`.

Improve issue creation form

Merge pull request #882 from garygreen/shorten-commit-message ...

File listing and sidebar display improvements

Update merge guide

File listing and sidebar display improvements

Merge branch 'link-width' of https://github.com/garygreen/gitbucket into garygreen-link-width

Improve the pull request creation form

Remove unused code

Improve comparing view

Merge branch 'master' of https://github.com/takezoe/gitbucket

Improve th background color

Merge pull request #880 from garygreen/issues-gui ...

Improved design of issue

(refs #878)Hide the Delete button for other than the head of branch

(refs #871)Make link for @mention which contains dot

Improved design of issue

Update main.scala.html ...

fix header plus dropdown menu display bug in safari and add 'Your profile' in user dropdown menu

(refs #865)Fix styles for repository viewer

(refs #865)Fix paginator of the commit list

(refs #865)Update commit list presentation

(refs #865)Fix presentation of file finder and blow view

(refs #865)Apply the flat style to box headers

Merge pull request #862 from McFoggy/plugins-info ...

list installed plugins in the system administration menu

add a comprehensive message when no plugin is detected on the installation