api/webserver: register RemoveUser for DELETE requests on /users
api/webserver: register RemoveUser for DELETE requests on /users

Related to #12.

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