* Renamed PostReport to Report
* Added report button to SPV
* Updated rspec

refs diaspora/diaspora#4732
refs diaspora/diaspora#4710
refs diaspora/diaspora#4711
refs diaspora/diaspora#4517

Fixed in streams

You can report a single post by clicking the correct icon in the controler section

Workflow:
* Report a post as offensive
* Trigger alerts to every pod-admin
* Pod-admin can review it in the admin interface
* Delete the post or mark it as reviewed

Fix spinner overlapping in webkit search box (#4446) and replace deprecated pseudo class :-moz-placeholder

- Introduced text-dark-grey = #666666
- Converted text colors #777777 and #555555 to text-dark-grey
- Removed header-grey in favor of text-grey
- Included colors in a couple of files where it was missing
- Categorized the colors in the palette based on the contexts of usage

Substituting -grey for #999

Moving #888 text color to -grey

Adding border-dark-grey

Removing border-dark-grey from places where it isn't appropriate

- This action needn't be performed when all notifications are read,
  hence disabling it is a good practice
- Added a link-disabled-color
- Used css pointer-events to disable clicking on the link

Preventing default on click for the mark_all_read_link

- avoiding the use of pointer-events
- setting up disabled only for mark_all_read_link

Moved disabling of the link to a global handler

- Added disabled class to the button in /notifications when all are read
- Styled the disabled button
- Adding disabled class after completion of ajaxRequest

- Pulled out the existing palette in _mixins
- Took a stab at naming greys after their usage count in contexts
- Replaced #a40802 with #a80000, since they are very close and $red was already in the palette

Missed importing 'colors' in a couple of places

Removing a redefined  in favor of  in colors.css.scss

Fixing missed imports #2

Renamed $background to $background-white

Explicitly calling out the color of the background, since we have many
background colors

- It was wide on firefox and narrow on chrome
- This fits it within the parent's padding on all browsers

Added white versions of the icons on hover to match the hover of other
header items.
Changing the notifications hover icon to the regular notifications icon when active so
it is visible with the white background.

Fixing the hard coded background-position value for notifications_grey

Can not depend on generated sprite background position as it will change
with changes in icons

Moving the $icons variable to a broader scope

Since the variable is used in the header, the sprites now are imported
before the header

Using the default sprite map instead of the explicitly created sprite map

* Hopefully fix OEmbed view
* Fix OpenGraph view
* Fix middle border
* Add spacing at the bottom
* Fix comment styles by not including old SPV styles for them (TODO: maybe rescue some stuff there, like the code tag styling)
* Fix avatar size for default avatar
* Remove border below comment pane
* Fix overflow of post body with a lot of text
* Fix stylesheet inclusion

* titlecase "Photos"
* Pull "See all" to the left (to match up with  "View all")
* Replace "See all" with "View all"