app: add config to the platform
app: add config to the platform

Right now we're going to have only memory limit per platform, but we can
expand later.

Related to #875.

tsuru/tsuru,cgvarela/tsuru,hcxiong/tsuru,4eek/tsuru,hugoantunes/tsuru,tsuru/tsuru,jblancett/tsuru,gciotta/tsuru,Endika/tsuru,ArxdSilva/tsuru,tuxmonteiro/tsuru,cezarsa/tsuru,kgrvamsi/tsuru,ArxdSilva/tsuru,4eek/tsuru,ggarnier/tsuru,mderaldo/tsuru,jblancett/tsuru,gwmoura/tsuru,hcxiong/tsuru,guilhermebr/tsuru,firebitsbr/tsuru,cezarsa/tsuru,cezarsa/tsuru,RichardKnop/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,kgrvamsi/tsuru,gciotta/tsuru,ggarnier/tsuru,cgvarela/tsuru,guilhermebr/tsuru,cezarsa/tsuru,tsuru/tsuru,ArxdSilva/tsuru,hugoantunes/tsuru,gwmoura/tsuru,jblancett/tsuru,kgrvamsi/tsuru,firebitsbr/tsuru,cgvarela/tsuru,ArxdSilva/tsuru,guilhermebr/tsuru,mderaldo/tsuru,ggarnier/tsuru,Endika/tsuru,ggarnier/tsuru,firebitsbr/tsuru,tuxmonteiro/tsuru,tuxmonteiro/tsuru,hcxiong/tsuru,gciotta/tsuru,4eek/tsuru,gwmoura/tsuru,RichardKnop/tsuru,Endika/tsuru,tsuru/tsuru,mderaldo/tsuru