Allow adding blueprint to sprint from the sprint page

<elkbuntu> Is spec/blueprint/whateveritisnow proposing disabled for UDS-Sevilla? If not, I can't seem to find where to do it. If so, when will we be able to propose stuff?
<carlos> elkbuntu: it's not disabled
<carlos> elkbuntu: go to https://blueprints.launchpad.net/ubuntu
<carlos> choose the spec you want to propose
<carlos> and select the 'Propose for meeting agenda' action
<elkbuntu> carlos, ah ok. i was trying to do it from the sprint page