fix Issue #378
Add member list on group page
Fix login page
Add join/left button to group page
Merge pull request #405 from godu/master

Improve group's page
Issue #400
issue #377, send 404 error for deleted files
Merge pull request #406 from hellsingblack/master

Issue #400
issue #377, send 404 error for deleted files
Merge pull request #407 from hellsingblack/master

issue #377, send 404 error for deleted files
issue #377, send 404 error for deleted files
local storage module tatam
Merge pull request #409 from hellsingblack/master

Local storage module tatam
Wording
Fixed #392
Fixed #408
Method renaming
fix bug textarea
issues #400 File upload not usable when browser loses focus
Backend for #333