update(backdrop, css): transition background-color alpha instead of opacity
update(backdrop, css): transition background-color alpha instead of opacity

BREAKING CHANGE:  performance improvements transitioning background-color alpha instead of container opacity.

Previously:

```css
 &.ng-enter {
    opacity: 0;
    &.ng-enter-active {
      opacity: 1;
    }
  }
```

Now uses background color changes only for `.md-opaque`

```css
  &.md-opaque.ng-enter {
    background-color: rgba(0,0,0,0);

    &.md-opaque.ng-enter-active {
      background-color: rgba(0,0,0,0.42);
    }
  }
```

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a/material,armst0910/material,amithub/Angular-Material-Web-Design,sandeeppatidar/material,kamilkisiela/material,Verarxar/material,Teremok/material,ByJC/material,jensenbox/material,nconrad/material,xiexingen/material,pwistbac/material,Mexiswow/material,jianwang195823/material,JsonChiu/material,Zagorakiss/material-1,lukascivil/material,hodeyp/material,wisavalite/material,Verarxar/material,colinskow/material,tarnas14/material,veraksar/material,hitesh97/material,quietshu/material,isaaclyman/material,sscovil/material,1012/material,Androguide/material,crisbeto/material,JonFerrera/material,brian-lewis/material,bjfletcher/material,IRlyDontKnow/material,bluebirdtech/material,SagarNaliyapara/material,AladdinSonni/material,java02014/material-1,brunoqc/material,Arteaga2k/material,hiteshsuthar/material,ByJC/material,ashwathgovind/material,marduke182/material,paulflo150/material,JonFerrera/material,noamshemesh/material,huoxudong125/material,flowersinthesand/material,marpontes/material,arush/material,mohislm/material,Drooids/material,dalong123/material,deerawan/material,programmist/material,p5150j/material,miguelcobain/material,jianwang195823/material,Splaktar/material,mattiLeBlanc/material,cdriscol/material,DevVersion/material,ByJC/material,onumossn/material,BernhardRode/material,profoundry-us/material,n1vlac/material,Patrik-Lundqvist/material,gabimanea/material,iksose/material,Sravyaksr/material,wisavalite/material,sscovil/material,Bhavinshah5111/material,lukascivil/material,weebygames/material,antoniosejas/material,bOOm-X/material,ByJC/material,DevVersion/material,b-cuts/material,2947721120/angular-material,alfirin/material,vertazzar/material,ebulay/material,marekmicek/material,garmoshka-mo/material,dreamoftrees/material,amithub/Angular-Material-Web-Design,bendroid/material,welkinhealth/material,xale/material,colinskow/material,angular/material,masterpowers/material,mlabieniec/material,shyndman/material,jianwang195823/material,keshavos/material,EladBezalel/material,Frank3K/material,jmcabandara/material,dreamoftrees/material,jadjoubran/material,hodeyp/material,loic/material,lukascivil/material,marduke182/material,SamDLT/material,armst0910/material,asonni/material,hayloft/material,loic/material,arush/material,izeau/material,bjfletcher/material,mobinni/material,brian-lewis/material,daniel-nagy/material,brunoqc/material,mobinni/material,JayQuerido/material,Arteaga2k/material,DevVersion/material,clshortfuse/material,b-cuts/material,miaotmac/material,gabimanea/material,tarnas14/material,huoxudong125/material,deerawan/material,arlowhite/material,hitesh97/material,oostmeijer/material,kwypchlo/material,dlochrie/material,m0g/material,miguelcobain/material,ErinCoughlan/material,Patrik-Lundqvist/material,eloytoro/material,jmcabandara/material,isaaclyman/material,daniel-nagy/material,mightyselva/material,bendroid/material,SagarNaliyapara/material,weebygames/material,sandeeppatidar/material,zhhb/material,asonni/material,mlabieniec/material,jensenbox/material,hesling/material,CarmenPopoviciu/material,ilovezy/material,wanmifam/material,quietshu/material,j3ski/material,angular/material,DerekLouie/material,IRlyDontKnow/material,ebulay/material,hannahhoward/material,dlochrie/material,Zagorakiss/material-1,Benew/material,stephen-james/material,onumossn/material,Benew/material,kennethcachia/material,pijey/material,victorivens05/material,taranjeetsapra/material,kwypchlo/material