Fixed assets path in luci-commotion-apps

[areynold]

Apps will not be advertised correctly until #44 is resolved.

To test:

1. SSH/telnet to the node and type ls /www/luci-static. You should not see an apps directory.
2. Type opkg files luci-commotion-apps. You should get the following: /www/luci-static/commotion/code.png /www/luci-static/commotion/equals.png /www/luci-static/commotion/radio.png /www/luci-static/commotion/apps_form.js /www/luci-static/commotion/chat.png /www/luci-static/commotion/audio.png /www/luci-static/commotion/apps.js /usr/lib/lua/luci/controller/commotion/apps_controller.lua /usr/lib/lua/luci/view/commotion/apps_view.htm /www/luci-static/commotion/x.png /usr/lib/lua/luci/model/cbi/commotion/app_settings.lua /usr/lib/lua/luci/view/themes/commotion/apps_apps.htm /usr/lib/lua/luci/view/commotion/apps_settings.htm /www/luci-static/commotion/write.png /www/luci-static/commotion/email.png /www/luci-static/commotion/commotion-faded2.png /www/luci-static/commotion/calendar.png /www/luci-static/commotion/internet.png /usr/lib/lua/luci/view/commotion/apps_display.htm /usr/lib/lua/luci/view/themes/commotion/apps_categories.htm /www/luci-static/commotion/check.png /www/luci-static/commotion/commotion-faded.png /www/luci-static/commotion/downloads.png /usr/lib/lua/luci/view/commotion/apps_form.htm /www/luci-static/commotion/apps.css /www/luci-static/commotion/bann.png /www/luci-static/commotion/admin_apps.js /www/luci-static/commotion/photo.png /www/luci-static/commotion/patternizer.min.js /usr/lib/lua/luci/view/commotion/apps_admin_display.htm

Fixes #55