a bit of restyling. Replace some images with icons. Simplify note form

app/assets/images/home_icon.PNG

app/assets/images/icon-attachment.png

app/assets/javascripts/notes.js

app/assets/stylesheets/common.scss

app/assets/stylesheets/sections/nav.scss

app/assets/stylesheets/sections/notes.scss

app/views/layouts/admin.html.haml

app/views/layouts/application.html.haml

app/views/layouts/group.html.haml

app/views/layouts/profile.html.haml

app/views/layouts/project_resource.html.haml

app/views/layouts/user_team.html.haml

app/views/notes/_form.html.haml

app/views/notes/_note.html.haml