MixCloud oEmbed support

Adding support for MixCloud oEmbed
Added MixCloud oEmbed to oembed_providers_list
Locator feature

added marker image for publisher, showing div for address, and added
functionality to close it when clicking 'X' image

showing marker image in publisher

renamed map-marker to locator

fixed style for map marker image in publisher

added locator.js to get user's location

loading google maps api

removed unecessary append and showing location next to publisher

moved location address inside div and  added image to close location

styled div location address an image to close location

removing location when clicking close image

cleaned code

cleaned code

showing loader while location is being obtained, translated normal js to
backbone structure, created locations db stuff, and removing location
div when clicking 'share'

refactored code; started to move code to backbone

refactored js code; moving functionality to backbone structure

created address function to make accessible address variable value

refactored locator.js

showing and removing location div from dom
drop another capistrano leftove
Fix reading of redis namespace from config

Changed default to nil to not screw users running develop alread
Update _header.html.haml

Change blog url, now there is no 301 required :)
Merge pull request #4146 from eloydegen/patch-1

Update _header.html.ha
Merge branch 'locator' of git://github.com/tangosource/diaspora into tangosource-locato
add changelog entry for locator [ci skip
Merge branch 'develop' of https://github.com/diaspora/diaspora into develop
oembed_providers.yml added for custom (outside of ruby-oembed) oEmbed providers.
Merge pull request #4131 from Ruxton/patch-1

Refactoring oEmbed Providers & Adding MixCloud oEmbed suppo
Fix preview with locator feature
Merge pull request #4147 from svbergerem/post-preview-locator

Fix preview with locator featu