Added Arbre Element#opening_tag and Element#closing_tag
Added Arbre Element#opening_tag and Element#closing_tag

This gives components an easy place to hook in to to add content at
the beginning or end of their tags.

Andrekra/activeadmin,artofhuman/activeadmin,mrjman/activeadmin,sanyaade-iot/activeadmin,Some1Else/activeadmin,jclay/active_admin,chdem/activeadmin,adibsaad/activeadmin,activeadmin/activeadmin,saiqulhaq/activeadmin,Ryohu/activeadmin,hobbes37/activeadmin,waymondo/active_admin,tjgrathwell/activeadmin,gogovan/activeadmin,vytenis-s/activeadmin,dhartoto/activeadmin,scarver2/activeadmin,keichan34/active_admin,alonerage/activeadmin,JeffreyATW/activeadmin,buren/activeadmin,quikly/active_admin,dhartoto/activeadmin,scarver2/activeadmin,applexiaohao/activeadmin,totzyuta/activeadmin,adibsaad/activeadmin,lampo/activeadmin,bcavileer/activeadmin,strivedi183/activeadmin,getkiwicom/activeadmin,mediebruket/activeadmin,gogovan/activeadmin,dalegregory/activeadmin,lampo/activeadmin,vraravam/activeadmin,saiqulhaq/activeadmin,Davidzhu001/activeadmin,Ibotta/activeadmin,JeffreyATW/activeadmin,quikly/active_admin,Ryohu/activeadmin,deivid-rodriguez/activeadmin,Amandeepsinghghai/activeadmin,FundingGates/activeadmin,dalegregory/activeadmin,ishumilova/activeadmin,samvincent/active_admin,Some1Else/activeadmin,totzyuta/activeadmin,bloomrain/activeadmin,mynksngh/activeadmin,senid231/activeadmin,whatcould/active_admin,sharma1nitish/activeadmin,tjgrathwell/activeadmin,rubixware/activeadmin,senid231/activeadmin,varyonic/activeadmin,jclay/active_admin,saveav/activeadmin,FundingGates/activeadmin,mauriciopasquier/active_admin,lampo/activeadmin,bolshakov/activeadmin,beyondthestory/activeadmin,totzyuta/activeadmin,tf/activeadmin,mauriciopasquier/active_admin,bloomrain/activeadmin,Some1Else/activeadmin,rubixware/activeadmin,mediebruket/activeadmin,sharma1nitish/activeadmin,timoschilling/activeadmin,davydovanton/activeadmin,varyonic/activeadmin,quikly/active_admin,cmunozgar/activeadmin,hobbes37/activeadmin,hobbes37/activeadmin,ampinog/activeadmin,westonplatter/activeadmin,dannyshafer/activeadmin,JeffreyATW/activeadmin,mohitnatoo/activeadmin,whatcould/active_admin,javierjulio/activeadmin,Ibotta/activeadmin,bcavileer/activeadmin,Ibotta/activeadmin,bolshakov/activeadmin,alonerage/activeadmin,Amandeepsinghghai/activeadmin,thomascarterx/activeadmin,waymondo/active_admin,maysam/activeadmin,wspurgin/activeadmin,thomascarterx/activeadmin,iuriandreazza/activeadmin,sanyaade-iot/activeadmin,ampinog/activeadmin,beyondthestory/activeadmin,timoschilling/activeadmin,mohitnatoo/activeadmin,davydovanton/activeadmin,hiroponz/activeadmin,wspurgin/activeadmin,activeadmin/activeadmin,tf/activeadmin,rtrepo/activeadmin,mwlang/active_admin,mwlang/active_admin,dhartoto/activeadmin,mateusg/active_admin,iuriandreazza/activeadmin,h2ocube/active_admin,Andrekra/activeadmin,thomascarterx/activeadmin,activeadmin/activeadmin,halilim/activeadmin,strivedi183/activeadmin,krautcomputing/activeadmin,siutin/activeadmin,bloomrain/activeadmin,danielevans/activeadmin,maysam/activeadmin,yeti-switch/active_admin,MohamedHegab/activeadmin,jethroo/activeadmin,vraravam/activeadmin,danielevans/activeadmin,shishir127/activeadmin,waymondo/active_admin,mauriciopasquier/active_admin,tf/activeadmin,hyperoslo/activeadmin,h2ocube/active_admin,mynksngh/activeadmin,westonplatter/activeadmin,jethroo/activeadmin,saveav/activeadmin,iguchi1124/activeadmin,siutin/activeadmin,rtrepo/activeadmin,cmunozgar/activeadmin,chrisseldo/activeadmin,saveav/activeadmin,buren/activeadmin,Ryohu/activeadmin,shishir127/activeadmin,sharma1nitish/activeadmin,Pollywog23/activeadmin,hyperoslo/activeadmin,senid231/activeadmin,krautcomputing/activeadmin,sanyaade-iot/activeadmin,Pollywog23/activeadmin,scarver2/activeadmin,Skulli/activeadmin,MohamedHegab/activeadmin,MohamedHegab/activeadmin,buren/activeadmin,ampinog/activeadmin,keichan34/active_admin,beyondthestory/activeadmin,iuriandreazza/activeadmin,iuriandreazza/activeadmin,seanski/activeadmin,Skulli/activeadmin,SoftSwiss/active_admin,vraravam/activeadmin,timoschilling/activeadmin,varyonic/activeadmin,Davidzhu001/activeadmin,Skulli/activeadmin,siutin/activeadmin,chdem/activeadmin,chdem/activeadmin,deivid-rodriguez/activeadmin,rubixware/activeadmin,ishumilova/activeadmin,Amandeepsinghghai/activeadmin,applexiaohao/activeadmin,hiroponz/activeadmin,getkiwicom/activeadmin,strivedi183/activeadmin,keichan34/active_admin,mohitnatoo/activeadmin,danielevans/activeadmin,getkiwicom/activeadmin,chrisseldo/activeadmin,mediebruket/activeadmin,presskey/activeadmin,bcavileer/activeadmin,deivid-rodriguez/activeadmin,mynksngh/activeadmin,vytenis-s/activeadmin,jclay/active_admin,rtrepo/activeadmin,westonplatter/activeadmin,SoftSwiss/active_admin,h2ocube/active_admin,chrisseldo/activeadmin,iuriandreazza/activeadmin,whatcould/active_admin,dalegregory/activeadmin,yeti-switch/active_admin,maysam/activeadmin,saiqulhaq/activeadmin,ishumilova/activeadmin,vytenis-s/activeadmin,mwlang/active_admin,zfben/activeadmin,krautcomputing/activeadmin,iuriandreazza/activeadmin,Pollywog23/activeadmin,alonerage/activeadmin,yeti-switch/active_admin,dannyshafer/activeadmin,shishir127/activeadmin,SoftSwiss/active_admin,adibsaad/activeadmin,artofhuman/activeadmin,mateusg/active_admin,mrjman/activeadmin,cmunozgar/activeadmin,FundingGates/activeadmin,javierjulio/activeadmin,zfben/activeadmin,hiroponz/activeadmin,seanski/activeadmin,javierjulio/activeadmin,samvincent/active_admin,mrjman/activeadmin,halilim/activeadmin,seanski/activeadmin,zfben/activeadmin,temochka-test/activeadmin,dannyshafer/activeadmin,iuriandreazza/activeadmin,temochka-test/activeadmin,artofhuman/activeadmin,yijiasu/activeadmin,davydovanton/activeadmin,samvincent/active_admin,wspurgin/activeadmin,gogovan/activeadmin,tjgrathwell/activeadmin,presskey/activeadmin,jethroo/activeadmin,iguchi1124/activeadmin,hyperoslo/activeadmin,Davidzhu001/activeadmin,yijiasu/activeadmin,halilim/activeadmin,applexiaohao/activeadmin,mateusg/active_admin,Andrekra/activeadmin,yijiasu/activeadmin,presskey/activeadmin,temochka-test/activeadmin,bolshakov/activeadmin,iguchi1124/activeadmin