gitreceived: Fix path handling
gitreceived: Fix path handling

Use filepath.Join and a helper function for cache URLs.

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

kgrz/flynn,technosophos/flynn,schatt/flynn,josephglanville/flynn,GrimDerp/flynn,felixrieseberg/flynn,justintung/flynn,TribeMedia/flynn,ozum/flynn,GrimDerp/flynn,tonicbupt/flynn,flynn/flynn,philiplb/flynn,clifff/flynn,arekkas/flynn,Brandywine2161/flynn,supermario/flynn,josephglanville/flynn,ozum/flynn,shads196770/flynn,arekkas/flynn,tonicbupt/flynn,Brandywine2161/flynn,flynn/flynn,technosophos/flynn,kgrz/flynn,technosophos/flynn,whouses/flynn,jzila/flynn,jzila/flynn,tonicbupt/flynn,benbjohnson/flynn,josephglanville/flynn,lmars/flynn,philiplb/flynn,philiplb/flynn,justintung/flynn,schatt/flynn,arekkas/flynn,supermario/flynn,jzila/flynn,Brandywine2161/flynn,whouses/flynn,TribeMedia/flynn,flynn/flynn,shads196770/flynn,clifff/flynn,schatt/flynn,supermario/flynn,rikur/flynn,felixrieseberg/flynn,jzila/flynn,shads196770/flynn,josephglanville/flynn,ozum/flynn,lmars/flynn,GrimDerp/flynn,benbjohnson/flynn,whouses/flynn,whouses/flynn,Brandywine2161/flynn,rikur/flynn,TribeMedia/flynn,kgrz/flynn,supermario/flynn,felixrieseberg/flynn,justintung/flynn,benbjohnson/flynn,flynn/flynn,tonicbupt/flynn,pkdevbox/flynn,GrimDerp/flynn,josephglanville/flynn,lmars/flynn,supermario/flynn,technosophos/flynn,pkdevbox/flynn,arekkas/flynn,rikur/flynn,whouses/flynn,schatt/flynn,jzila/flynn,ozum/flynn,rikur/flynn,shads196770/flynn,benbjohnson/flynn,pkdevbox/flynn,flynn/flynn,josephglanville/flynn,shads196770/flynn,clifff/flynn,ozum/flynn,justintung/flynn,felixrieseberg/flynn,GrimDerp/flynn,justintung/flynn,philiplb/flynn,tonicbupt/flynn,lmars/flynn,Brandywine2161/flynn,kgrz/flynn,kgrz/flynn,benbjohnson/flynn,supermario/flynn,ozum/flynn,pkdevbox/flynn,pkdevbox/flynn,jzila/flynn,lmars/flynn,shads196770/flynn,clifff/flynn,schatt/flynn,felixrieseberg/flynn,rikur/flynn,kgrz/flynn,clifff/flynn,pkdevbox/flynn,whouses/flynn,Brandywine2161/flynn,technosophos/flynn,rikur/flynn,schatt/flynn,TribeMedia/flynn,clifff/flynn,GrimDerp/flynn,philiplb/flynn,justintung/flynn,benbjohnson/flynn,TribeMedia/flynn,TribeMedia/flynn,arekkas/flynn