add tarballs to .gitignore
add tarballs to .gitignore

Summary:
@public
release tarballs generated by our scripts should be ignored.

Test Plan:
put all the tarballs in infer/ (sources, osx, linux), git status doesn't show
them.

jvillard/infer,hckhanh/infer,hawkinchina/facebook-,roth1002/infer,xennygrimmato/infer,occho/infer,ropas/infer,RogerGan/infer,ryoon/infer,DoctorQ/infer,hcxiong/infer,roth1002/infer,xennygrimmato/infer,Youthcomes/infer,podilaaditya/infer,wangwei1237/infer,RogerGan/infer,kageiit/infer,hai8108/infer,podilaaditya/infer,MichaelMaGG/infer,facebook/infer,xennygrimmato/infer,xennygrimmato/infer,wangwei1237/infer,srekcah/infer,DoctorQ/infer,jvillard/infer,liuyunclouder/infer,liuyunclouder/infer,hai8108/infer,RogerGan/infer,hawkinchina/facebook-,feilongzheng/infer,ropas/infer,hailinzeng/infer,kageiit/infer,facebook/infer,saimed/infer,jvillard/infer,blzq/infer,hcxiong/infer,occho/infer,jvillard/infer,sdgdsffdsfff/infer,DoctorQ/infer,ropas/infer,algobardo/infer,hawkinchina/facebook-,kageiit/infer,Geoion/infer,DoctorQ/infer,saimed/infer,liuyunclouder/infer,algobardo/infer,raphaelamorim/infer,blzq/infer,YelaSeamless/infer,hawkinchina/facebook-,YelaSeamless/infer,xennygrimmato/infer,hckhanh/infer,liuyunclouder/infer,kstreee/infer,sdgdsffdsfff/infer,shadmazumder/infer,algobardo/infer,liuyunclouder/infer,hcxiong/infer,occho/infer,srekcah/infer,shadmazumder/infer,roth1002/infer,MichaelMaGG/infer,kstreee/infer,YelaSeamless/infer,yas375/infer,RogerGan/infer,kstreee/infer,hailinzeng/infer,hawkinchina/facebook-,hcxiong/infer,feilongzheng/infer,sdgdsffdsfff/infer,jsachs/infer,hailinzeng/infer,Youthcomes/infer,jsachs/infer,shadmazumder/infer,facebook/infer,hailinzeng/infer,raphaelamorim/infer,raphaelamorim/infer,YelaSeamless/infer,RogerGan/infer,feilongzheng/infer,jsachs/infer,saimed/infer,algobardo/infer,hailinzeng/infer,blzq/infer,hawkinchina/facebook-,kstreee/infer,algobardo/infer,srekcah/infer,jsachs/infer,YelaSeamless/infer,DoctorQ/infer,Geoion/infer,kageiit/infer,shadmazumder/infer,wangwei1237/infer,Geoion/infer,ropas/infer,yas375/infer,jsachs/infer,MichaelMaGG/infer,saimed/infer,hai8108/infer,saimed/infer,hailinzeng/infer,hai8108/infer,ropas/infer,hcxiong/infer,kageiit/infer,hckhanh/infer,hckhanh/infer,Youthcomes/infer,ryoon/infer,raphaelamorim/infer,podilaaditya/infer,blzq/infer,blzq/infer,liuyunclouder/infer,wangwei1237/infer,hckhanh/infer,Youthcomes/infer,xennygrimmato/infer,raphaelamorim/infer,DoctorQ/infer,hai8108/infer,sdgdsffdsfff/infer,jvillard/infer,facebook/infer,roth1002/infer,feilongzheng/infer,feilongzheng/infer,MichaelMaGG/infer,facebook/infer,yas375/infer,algobardo/infer,hai8108/infer,kageiit/infer,feilongzheng/infer,ropas/infer,ryoon/infer,raphaelamorim/infer,ryoon/infer,Geoion/infer,jvillard/infer,occho/infer,sdgdsffdsfff/infer,podilaaditya/infer,MichaelMaGG/infer,podilaaditya/infer,podilaaditya/infer,YelaSeamless/infer,wangwei1237/infer,kageiit/infer,roth1002/infer,RogerGan/infer,MichaelMaGG/infer,facebook/infer,ryoon/infer,Geoion/infer,roth1002/infer,shadmazumder/infer,jvillard/infer,Youthcomes/infer,srekcah/infer,xennygrimmato/infer,kstreee/infer,hcxiong/infer,Youthcomes/infer,wangwei1237/infer,yas375/infer,yas375/infer,saimed/infer,shadmazumder/infer,facebook/infer,srekcah/infer,Geoion/infer,srekcah/infer,occho/infer,sdgdsffdsfff/infer,occho/infer,yas375/infer,kstreee/infer,blzq/infer,hckhanh/infer,jsachs/infer,ryoon/infer