don't distort resized images

If images have width/height attributes set and are reduced in size by max-width: auto, they look distorted. height: auto fixes this.
api: add score to getHeadlines/getArticle
ttrssZoom: fix image width
Merge pull request #150 from levito/patch-1

don't distort resized images
Merge branch 'master' of github.com:gothfox/Tiny-Tiny-RSS
use height : auto in ttrssZoom
use height : auto in cdmContentInner
implement basic feed authentication parameter encryption in the database (FEED_CRYPT_KEY)
fix handling of blank FEED_CRYPT_KEY
fix double-escaping possible with encrypted passwords
german translation update
Merge pull request #153 from HeikoAdams/master

German translation updated
subscribe_to_feed: fix typo
quickAddFeed: add placeholder select element to feeds dropdown
use mdash as a separator between title and author
add a %d articles selected element
Added average color calculation of feeds' favicons for banded display.
fix schema for favicon_avg_color
store favicon color as #rrggbb; process existing favicons
only enable colored favicons in vfeeds; fix RGB triplet packing