Security fix and new download attachment feature
Security fix and new download attachment feature

- users can now download attachments using the APIkey

- security issue fixed where a user could download attachments that he/she can't even see by navigating to attributes/download/<attribute_id>

SteveClement/MISP,Maijin/MISP,crruthe/MISP,pombredanne/MISP,jiekechoo/MISP,pombredanne/MISP,RichieB2B/MISP,elhoim/MISP,triplekill/MISP,RichieB2B/MISP,TheDr1ver/MISP,x86Labs/MISP,SteveClement/MISP,devnull-/MISP,aaronkaplan/MISP,Maijin/MISP,RichieB2B/MISP,SteveClement/MISP,FIRSTdotorg/MISP,Rafiot/MISP,jiekechoo/MISP,FloatingGhost/MISP,RichieB2B/MISP,pombredanne/MISP,cristianbell/MISP,aaronkaplan/MISP,elhoim/MISP,regit/MISP,cristianbell/MISP,crruthe/MISP,triplekill/MISP,MISP/MISP,MISP/MISP,0x0mar/MISP,TheDr1ver/MISP,FIRSTdotorg/MISP,0x0mar/MISP,aaronkaplan/MISP,FIRSTdotorg/MISP,Rafiot/MISP,cristianbell/MISP,regit/MISP,regit/MISP,Maijin/MISP,TheDr1ver/MISP,x86Labs/MISP,triplekill/MISP,x86Labs/MISP,SteveClement/MISP,jiekechoo/MISP,x86Labs/MISP,elhoim/MISP,Rafiot/MISP,devnull-/MISP,triplekill/MISP,MISP/MISP,elhoim/MISP,MISP/MISP,SteveClement/MISP,crruthe/MISP,cristianbell/MISP,FloatingGhost/MISP,regit/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,MISP/MISP,0x0mar/MISP,Maijin/MISP,aaronkaplan/MISP,pombredanne/MISP,0x0mar/MISP,devnull-/MISP,jiekechoo/MISP,devnull-/MISP,TheDr1ver/MISP,crruthe/MISP,FloatingGhost/MISP,Rafiot/MISP