add spiner when downloading files
fix the bug of spinner when the file is not supported to open with
change alert message to show what is going on when user want to open file
Merge branch 'stian' into devBrian
fix bug code in the new messageboard service
refactory the fetch wiki content list function and unit test
refactory the fetch single wiki page function and unit test
refactory the wiki page controller
Merge branch 'master' into stian
wiki content now supports internal links as long as links are references to other wikis in WebStorage or references to 'forum' 'documenter' or 'tavle'