Fix scroll issue

Fixes #1886

See merge request !1396

This reverts commit 1e45ba7f.

This reverts commit 204b3c12.

Fix anchor bug

Fixes #1886

See merge request !1395

When use anchors - conetent gets hidden under navbar. This commit fixes
with hack using margin+height combination

This reverts commit b1792d9e.

This reverts commit 5140bd88.

Rescue database error

We need to check which database is setup but we cannot assume that the database exists already. Not checking this will break rake gitlab:setup for packaging as we need to do asset precompile before the database exists.

See merge request !1393

Enable signup by default

See merge request !1394

Doorkeeper update

https://gitlab.com/gitlab-org/omnibus-gitlab/issues/398

See merge request !1392

Gitlab shell bump

See merge request !1391

OAuth2 API documentation

https://dev.gitlab.org/gitlab/gitlabhq/issues/1713

See merge request !1388

Conflicts:
	app/helpers/projects_helper.rb

Prose requirement

Feel free to improve or link to authoritative source.

See merge request !285

Improve readme to website

addresses some of https://dev.gitlab.org/gitlab/organization/issues/100.

See merge request !1355

First entry in wiki history leads to newest revision.

Scroll below the navbar

Fixes #1866

Show the markdown anchors by scrolling below the fixed top navbar.

See merge request !1390