Add more treebuilder tests
Add more treebuilder tests

The recent changes with git_treebuilder_entrycount point out that
the test coverage for git_treebuilder_remove and
git_treebuilder_entrycount is completely absent.  This adds tests.

mcanthony/libgit2,jamieleecool/ptest,claudelee/libgit2,Corillian/libgit2,ardumont/libgit2,oaastest/libgit2,t0xicCode/libgit2,evhan/libgit2,t0xicCode/libgit2,kenprice/libgit2,claudelee/libgit2,yongthecoder/libgit2,skabel/manguse,stewid/libgit2,skabel/manguse,JIghtuse/libgit2,magnus98/TEST,joshtriplett/libgit2,magnus98/TEST,maxiaoqian/libgit2,yongthecoder/libgit2,t0xicCode/libgit2,saurabhsuniljain/libgit2,nokiddin/libgit2,since2014/libgit2,dleehr/libgit2,iankronquist/libgit2,since2014/libgit2,since2014/libgit2,ardumont/libgit2,linquize/libgit2,mingyaaaa/libgit2,chiayolin/libgit2,evhan/libgit2,kenprice/libgit2,jeffhostetler/public_libgit2,magnus98/TEST,mingyaaaa/libgit2,leoyanggit/libgit2,kenprice/libgit2,yosefhackmon/libgit2,yongthecoder/libgit2,kissthink/libgit2,Corillian/libgit2,Snazz2001/libgit2,JIghtuse/libgit2,mrksrm/Mingijura,evhan/libgit2,Aorjoa/libgit2_maked_lib,Snazz2001/libgit2,sim0629/libgit2,Aorjoa/libgit2_maked_lib,kissthink/libgit2,JIghtuse/libgit2,sygool/libgit2,jflesch/libgit2-mariadb,Aorjoa/libgit2_maked_lib,chiayolin/libgit2,mrksrm/Mingijura,yongthecoder/libgit2,yosefhackmon/libgit2,rcorre/libgit2,raybrad/libit2,spraints/libgit2,mhp/libgit2,kenprice/libgit2,mcanthony/libgit2,joshtriplett/libgit2,ardumont/libgit2,stewid/libgit2,KTXSoftware/libgit2,leoyanggit/libgit2,ardumont/libgit2,dleehr/libgit2,jamieleecool/ptest,jeffhostetler/public_libgit2,Snazz2001/libgit2,whoisj/libgit2,amyvmiwei/libgit2,claudelee/libgit2,joshtriplett/libgit2,mrksrm/Mingijura,swisspol/DEMO-libgit2,nokiddin/libgit2,KTXSoftware/libgit2,stewid/libgit2,rcorre/libgit2,raybrad/libit2,saurabhsuniljain/libgit2,sim0629/libgit2,kenprice/libgit2,Tousiph/Demo1,zodiac/libgit2.js,stewid/libgit2,sim0629/libgit2,mingyaaaa/libgit2,rcorre/libgit2,dleehr/libgit2,linquize/libgit2,Corillian/libgit2,mhp/libgit2,saurabhsuniljain/libgit2,zodiac/libgit2.js,iankronquist/libgit2,rcorre/libgit2,spraints/libgit2,leoyanggit/libgit2,kissthink/libgit2,spraints/libgit2,spraints/libgit2,jeffhostetler/public_libgit2,Snazz2001/libgit2,jflesch/libgit2-mariadb,magnus98/TEST,mhp/libgit2,yosefhackmon/libgit2,t0xicCode/libgit2,raybrad/libit2,stewid/libgit2,mrksrm/Mingijura,sygool/libgit2,maxiaoqian/libgit2,skabel/manguse,kissthink/libgit2,whoisj/libgit2,sygool/libgit2,mcanthony/libgit2,oaastest/libgit2,skabel/manguse,KTXSoftware/libgit2,spraints/libgit2,nokiddin/libgit2,falqas/libgit2,kissthink/libgit2,JIghtuse/libgit2,yosefhackmon/libgit2,JIghtuse/libgit2,Snazz2001/libgit2,MrHacky/libgit2,rcorre/libgit2,mingyaaaa/libgit2,yongthecoder/libgit2,Corillian/libgit2,jeffhostetler/public_libgit2,dleehr/libgit2,claudelee/libgit2,amyvmiwei/libgit2,amyvmiwei/libgit2,jflesch/libgit2-mariadb,MrHacky/libgit2,rcorre/libgit2,mcanthony/libgit2,mingyaaaa/libgit2,saurabhsuniljain/libgit2,linquize/libgit2,leoyanggit/libgit2,skabel/manguse,mhp/libgit2,saurabhsuniljain/libgit2,MrHacky/libgit2,since2014/libgit2,falqas/libgit2,swisspol/DEMO-libgit2,iankronquist/libgit2,joshtriplett/libgit2,Snazz2001/libgit2,skabel/manguse,leoyanggit/libgit2,joshtriplett/libgit2,iankronquist/libgit2,t0xicCode/libgit2,mhp/libgit2,yosefhackmon/libgit2,since2014/libgit2,sygool/libgit2,falqas/libgit2,raybrad/libit2,MrHacky/libgit2,saurabhsuniljain/libgit2,swisspol/DEMO-libgit2,falqas/libgit2,zodiac/libgit2.js,jflesch/libgit2-mariadb,linquize/libgit2,MrHacky/libgit2,iankronquist/libgit2,spraints/libgit2,jeffhostetler/public_libgit2,yongthecoder/libgit2,zodiac/libgit2.js,maxiaoqian/libgit2,joshtriplett/libgit2,oaastest/libgit2,mingyaaaa/libgit2,Tousiph/Demo1,Corillian/libgit2,dleehr/libgit2,sygool/libgit2,amyvmiwei/libgit2,sim0629/libgit2,swisspol/DEMO-libgit2,ardumont/libgit2,jamieleecool/ptest,swisspol/DEMO-libgit2,swisspol/DEMO-libgit2,amyvmiwei/libgit2,Aorjoa/libgit2_maked_lib,magnus98/TEST,sygool/libgit2,MrHacky/libgit2,evhan/libgit2,mcanthony/libgit2,jeffhostetler/public_libgit2,mcanthony/libgit2,linquize/libgit2,linquize/libgit2,KTXSoftware/libgit2,t0xicCode/libgit2,oaastest/libgit2,whoisj/libgit2,leoyanggit/libgit2,Aorjoa/libgit2_maked_lib,mrksrm/Mingijura,oaastest/libgit2,JIghtuse/libgit2,magnus98/TEST,Tousiph/Demo1,chiayolin/libgit2,amyvmiwei/libgit2,claudelee/libgit2,maxiaoqian/libgit2,mhp/libgit2,maxiaoqian/libgit2,nokiddin/libgit2,nokiddin/libgit2,kenprice/libgit2,Tousiph/Demo1,whoisj/libgit2,Tousiph/Demo1,falqas/libgit2,since2014/libgit2,chiayolin/libgit2,chiayolin/libgit2,sim0629/libgit2,raybrad/libit2,Tousiph/Demo1,KTXSoftware/libgit2,yosefhackmon/libgit2,sim0629/libgit2,claudelee/libgit2,oaastest/libgit2,chiayolin/libgit2,whoisj/libgit2,kissthink/libgit2,falqas/libgit2,iankronquist/libgit2,whoisj/libgit2,jflesch/libgit2-mariadb,stewid/libgit2,dleehr/libgit2,maxiaoqian/libgit2,nokiddin/libgit2,mrksrm/Mingijura,zodiac/libgit2.js,ardumont/libgit2,jamieleecool/ptest,Corillian/libgit2,KTXSoftware/libgit2,jflesch/libgit2-mariadb