Fix Build#duration when TimeZone is not UTC

I got wrong Build#durations, cause ServerTime is not UTC.

Sample Output:
    $: build.from
    => Sat, 30 Mar 2013 16:58:42 UTC +00:00

    $: Time.now
     => 2013-03-30 18:20:25 +0100

    $: Time.zone.now
     => Sat, 30 Mar 2013 17:20:29 UTC +00:00
Update installation.md

Typo error
docs: don't need restart nginx to reload configuration
Create dirs for sockets and pids (otherwise GitLab CI service fails to start correctly)
Merge pull request #234 from WnP/patch-1

Update installation.md
Merge pull request #202 from jtreml/patch-3

Create dirs for sockets and pids (otherwise GitLab CI service fails to s...
Fix typos
Move puma configuration to an example file as done with the other config files
Merge pull request #244 from antonio/puma_rb_example

Move puma configuration to an example file
Merge pull request #243 from jojosch/fix-typos

Fix typos
Fix ui for 1366px displays
Add retry functionality
Lets do version 3.1
Update rails and puma
fix issuess #160
Merge pull request #247 from 1989car/master

try to fix issuess #160
Update installation.md
Merge pull request #249 from pmgarman/patch-1

Make --without option more clear in comments
Update installation.md
Paginate gitlab projects by 100