api/app: added unexported field in unit points to the unit's app
api/app: added unexported field in unit points to the unit's app

Related to #111.

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