fix header style to look the same as rest of ownCloud
add use icons for close and share buttons, fix position
fix wording of empty content message
fix position and style of document and memberlist, get rid of excessive shadows and styling
fix save text overlaying close x for shared documents
correctly position share dropdown
move changes from editor.css to style.css
Merge pull request #312 from owncloud/backport-design-fixes

Backport design fixes