Fixing request.fullpath URL encoding

Let's assume your path is = "project/tree/master/This%20Is%20valid"
In this case gitlab renders a 404.

To fix this we should decode the path so that it looks like
"project/tree/master/This Is valid"
a bit of restyling for issues and merge request lists
fix exemple js data in help/web_hook
Fixed tree logs for branches with slash. Fixed remember of path when switch branch
Merge pull request #2516 from jouve/fix_json_exemples_in_help

fix exemple js data in help/web_hook
Fix routing specs
Merge pull request #2484 from netdata/fix_url_encode

Fixing request.fullpath URL encoding
Rails upto 3.2.11
Fix gitolite installation path in gitlab:env:info

(related to #2480 and #2503)

This tasks presume of a fixed path for gitolite, relative to repos_path.
info.rake uses "#{Gitlab.config.gitolite.repos_path}/../gitolite/src/VERSION"

However, you can install gitolite wherever you want.
Hence this pathc:

M config/gitlab.yml.example:
  Add 'install_path' in 'gitolite' section
M lib/tasks/gitlab/info.rake:
  Uses '"#{Gitlab.config.gitolite.install_path}