Replace bootstrap sprites with font Awesome v3.2.1.


git-svn-id: http://observium.org/svn/observer/trunk@4275 61d68cd4-352d-0410-923a-c4978735b2b8
Change traffic icons, fix VLANs tooltip.


git-svn-id: http://observium.org/svn/observer/trunk@4276 61d68cd4-352d-0410-923a-c4978735b2b8