storage: Fix minifying CSS/JS files with unicode in them.
storage: Fix minifying CSS/JS files with unicode in them.

Previously, this header construction work would fail on Python 2 in
the case that there were unicode characters in the input.

aakash-cr7/zulip,brockwhittaker/zulip,Galexrt/zulip,j831/zulip,jphilipsen05/zulip,amanharitsh123/zulip,showell/zulip,kou/zulip,aakash-cr7/zulip,kou/zulip,souravbadami/zulip,j831/zulip,kou/zulip,zulip/zulip,JPJPJPOPOP/zulip,synicalsyntax/zulip,aakash-cr7/zulip,brockwhittaker/zulip,rishig/zulip,kou/zulip,timabbott/zulip,brockwhittaker/zulip,andersk/zulip,jainayush975/zulip,punchagan/zulip,hackerkid/zulip,brainwane/zulip,j831/zulip,jackrzhang/zulip,jainayush975/zulip,dhcrzf/zulip,jphilipsen05/zulip,jrowan/zulip,vabs22/zulip,zulip/zulip,jainayush975/zulip,vabs22/zulip,jrowan/zulip,verma-varsha/zulip,blaze225/zulip,ryanbackman/zulip,tommyip/zulip,samatdav/zulip,ryanbackman/zulip,amanharitsh123/zulip,rht/zulip,samatdav/zulip,jphilipsen05/zulip,showell/zulip,aakash-cr7/zulip,hackerkid/zulip,brockwhittaker/zulip,jainayush975/zulip,samatdav/zulip,punchagan/zulip,jphilipsen05/zulip,synicalsyntax/zulip,dhcrzf/zulip,punchagan/zulip,susansls/zulip,rishig/zulip,shubhamdhama/zulip,jphilipsen05/zulip,souravbadami/zulip,SmartPeople/zulip,rht/zulip,punchagan/zulip,j831/zulip,timabbott/zulip,showell/zulip,andersk/zulip,dhcrzf/zulip,brainwane/zulip,jackrzhang/zulip,samatdav/zulip,eeshangarg/zulip,brainwane/zulip,zulip/zulip,PhilSk/zulip,showell/zulip,JPJPJPOPOP/zulip,dawran6/zulip,eeshangarg/zulip,mahim97/zulip,jrowan/zulip,christi3k/zulip,shubhamdhama/zulip,timabbott/zulip,aakash-cr7/zulip,brockwhittaker/zulip,hackerkid/zulip,dattatreya303/zulip,rishig/zulip,amanharitsh123/zulip,susansls/zulip,rishig/zulip,rht/zulip,jackrzhang/zulip,SmartPeople/zulip,vabs22/zulip,dawran6/zulip,rht/zulip,ryanbackman/zulip,aakash-cr7/zulip,mahim97/zulip,j831/zulip,Galexrt/zulip,vabs22/zulip,brainwane/zulip,blaze225/zulip,sonali0901/zulip,Galexrt/zulip,PhilSk/zulip,andersk/zulip,vaidap/zulip,susansls/zulip,eeshangarg/zulip,susansls/zulip,Galexrt/zulip,vabs22/zulip,dattatreya303/zulip,showell/zulip,synicalsyntax/zulip,tommyip/zulip,PhilSk/zulip,JPJPJPOPOP/zulip,verma-varsha/zulip,PhilSk/zulip,verma-varsha/zulip,sonali0901/zulip,Galexrt/zulip,synicalsyntax/zulip,jackrzhang/zulip,souravbadami/zulip,hackerkid/zulip,Galexrt/zulip,SmartPeople/zulip,samatdav/zulip,shubhamdhama/zulip,shubhamdhama/zulip,verma-varsha/zulip,samatdav/zulip,dattatreya303/zulip,dattatreya303/zulip,andersk/zulip,rht/zulip,jackrzhang/zulip,andersk/zulip,tommyip/zulip,jainayush975/zulip,kou/zulip,synicalsyntax/zulip,christi3k/zulip,jainayush975/zulip,zulip/zulip,SmartPeople/zulip,timabbott/zulip,vaidap/zulip,mahim97/zulip,andersk/zulip,mahim97/zulip,christi3k/zulip,vaidap/zulip,punchagan/zulip,christi3k/zulip,blaze225/zulip,punchagan/zulip,dhcrzf/zulip,susansls/zulip,vaidap/zulip,christi3k/zulip,eeshangarg/zulip,PhilSk/zulip,mahim97/zulip,tommyip/zulip,dawran6/zulip,JPJPJPOPOP/zulip,tommyip/zulip,jackrzhang/zulip,ryanbackman/zulip,shubhamdhama/zulip,souravbadami/zulip,mahim97/zulip,zulip/zulip,timabbott/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,rishig/zulip,rishig/zulip,brainwane/zulip,dattatreya303/zulip,zulip/zulip,zulip/zulip,andersk/zulip,j831/zulip,dattatreya303/zulip,jrowan/zulip,brockwhittaker/zulip,ryanbackman/zulip,punchagan/zulip,sonali0901/zulip,eeshangarg/zulip,SmartPeople/zulip,dhcrzf/zulip,jackrzhang/zulip,SmartPeople/zulip,Galexrt/zulip,eeshangarg/zulip,dawran6/zulip,amanharitsh123/zulip,kou/zulip,tommyip/zulip,vabs22/zulip,brainwane/zulip,souravbadami/zulip,blaze225/zulip,PhilSk/zulip,blaze225/zulip,showell/zulip,amanharitsh123/zulip,kou/zulip,verma-varsha/zulip,sonali0901/zulip,souravbadami/zulip,shubhamdhama/zulip,rht/zulip,hackerkid/zulip,christi3k/zulip,dhcrzf/zulip,vaidap/zulip,shubhamdhama/zulip,hackerkid/zulip,dhcrzf/zulip,dawran6/zulip,verma-varsha/zulip,timabbott/zulip,sonali0901/zulip,synicalsyntax/zulip,ryanbackman/zulip,synicalsyntax/zulip,brainwane/zulip,rht/zulip,dawran6/zulip,timabbott/zulip,JPJPJPOPOP/zulip,tommyip/zulip,blaze225/zulip,susansls/zulip,JPJPJPOPOP/zulip,jphilipsen05/zulip,amanharitsh123/zulip,rishig/zulip,jrowan/zulip,jrowan/zulip,sonali0901/zulip,vaidap/zulip