Squashed 'contrib/' changes from 58aafd2..a72d5b8

a72d5b8 drop the "alpha" from the name
0beb2bd Autocompletion: Use some of our own colours for highlighted item.
e0d2d9f hide spoiler divs by default
ea31fe3 Don't allow Chromium (and other browsers) to highlight the currently focused input with some arbitrary colour that may not match the current Libertree theme.
6839c95 Inner shadow on textareas and text input boxen.
3c011dd Set padding for narrow screens, too.
04d7887 Apply padding consistently on post excerpt components.
7b5504b Slight increase in default line height. (line spacing)
0818fd4 Larger padding in post excerpt heading, to match padding of post excerpt body.
dc5a565 Slightly wider main menu icon area, so custom link icon doesn't overflow in Firefox 29.
866641f float message delete links to the right
349f3e7 filter images: mark links to files only
3ec8e9d shift panel/header on narrow screens with sidebar
7dd7939 clear space around form fields
2ed9c6d mark links to images when images are not rendered
d03ba55 oak theme: transparent gradient on "show more"
1cb4a77 oak theme: replace "show more/less" with arrows
054ca3c symlink default theme sources to oak theme dir
d61a8a3 symlink default theme sources to blue theme dir
7f17346 simplify sidebar float
e257267 move posts to the side even at 700-1060px
5c2bd5e implement text stat separators in CSS
0ba9612 hide river header in all stock themes
0534966 change float status of post-new form when sidebar appears
4b557e7 add left margin only when sidebar is shown
3bd91ca toggle with-sidebar class on panels, too
30314cf hide sidebar per default
ee3685a widen post-{new,edit} box a little
52b6039 unfloat post-extras
8e9831d adjust footnote styles
05749b6 break long lines in profile descriptions
67ef8f7 Add blue theme
6c44d22 improve intro on small screens
ec816ac also limit max-width of generic input fields
f195ac7 limit width of select2 elements
e73d954 fix sidebar margins on single-post view (see 695dcc5530301e)
e3efbb4 set main-menu-container to 100% on narrow screens
89ed2ca fix padding/margins on new post box in excerpt view
1b47642 remove back-to-top styles from narrow.scss
3fd3f5e place back-to-top links absolutely
60b8a03 adjust style of notifications page
7705795 fix sidebar offset on non-excerpts-view pages
3032eda fix 7df/438: non-excerpt pages are too wide
f0f5096 always show sidebar toggle
1f47109 display sidebar per default only on excerpts view (on wider screens)
9ea7b0f clean up the new post settings a little
e633338 reduced padding requires reduced negative margins
84e6e0a reduce padding on single post view (narrow)
191726f center comment form when avatar is hidden
20bbb4d reduce .flash width on narrow screens
4369609 reduce .main padding on narrow screens
c098332 stretch comment form when avatar is hidden
cc991cd chat: use full device width on small screens
39e066b unfix river textarea width on narrow screens
e708859 move river input field CSS to rivers.scss
8a885d5 move #textarea-description declaration to profiles.scss
68ed47a set textarea box sizing to border-box
2a447d0 Build all themes if no arguments are given
db70d7d set textarea box sizing to border-box
2572ee5 move textarea.custom declaration to accounts.scss
7ec69a9 use relative width for custom textfields at narrow screen widths
5f24d89 unfloat labels at narrow widths
c81753b refactor duplicate styles
070c0b7 fix regression: automatic width at narrow screens
ed65c5a drop left margin at minimum width
10eab89 themes: oak: hide current user's avatar next to comment form
3b4df0c absolute to relative width
9a4abe9 add separate theme for oak
e1ec50f there is no point in having a translucent sidebar
6cadf71 add sources for tree silhouette background
130a74a move icon sources from frontend to contrib repo
f953049 remove dead style definitions
4763596 correct margins in intro
51f471c change colour of select2 input field
dd02c6d correct mistake in default colour scheme

git-subtree-dir: contrib
git-subtree-split: a72d5b8dde9d2c07f73eca7fda0132eb8ec78282
Merge commit '7d73d61d61522f72a8f0510d1b2490f953d9635b'

Conflicts:
	contrib/themes/blue/images/wordmark.png
	contrib/themes/oak/images/wordmark.png