Added package documentation in api/doc.go.
Added package documentation in api/doc.go.

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