SWC-1542 and SWC-1543
fix login ui
fix SWC-1544, and Loading, and header icons
SWC-1545: fix wiki margins and subpages UI
SWC-1548: add space between markdown editor and commands. And fix wiki subpages UI. Also fix wiki page title text field
Merge pull request #1077 from jay-hodgson/gwtbootstrap3

SWC-1542 and SWC-1543