mypy: Migrate views/storage.py to python3.5 type annotations.
mypy: Migrate views/storage.py to python3.5 type annotations.

rht/zulip,showell/zulip,kou/zulip,shubhamdhama/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,rht/zulip,timabbott/zulip,jackrzhang/zulip,showell/zulip,jackrzhang/zulip,kou/zulip,kou/zulip,rishig/zulip,hackerkid/zulip,tommyip/zulip,timabbott/zulip,punchagan/zulip,andersk/zulip,eeshangarg/zulip,tommyip/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,rishig/zulip,showell/zulip,hackerkid/zulip,synicalsyntax/zulip,kou/zulip,synicalsyntax/zulip,synicalsyntax/zulip,eeshangarg/zulip,andersk/zulip,tommyip/zulip,eeshangarg/zulip,jackrzhang/zulip,andersk/zulip,punchagan/zulip,synicalsyntax/zulip,timabbott/zulip,punchagan/zulip,kou/zulip,synicalsyntax/zulip,rishig/zulip,synicalsyntax/zulip,tommyip/zulip,rishig/zulip,dhcrzf/zulip,shubhamdhama/zulip,brainwane/zulip,shubhamdhama/zulip,rishig/zulip,showell/zulip,zulip/zulip,hackerkid/zulip,showell/zulip,brainwane/zulip,tommyip/zulip,synicalsyntax/zulip,brainwane/zulip,timabbott/zulip,brainwane/zulip,rht/zulip,rishig/zulip,eeshangarg/zulip,punchagan/zulip,dhcrzf/zulip,timabbott/zulip,rht/zulip,jackrzhang/zulip,hackerkid/zulip,showell/zulip,hackerkid/zulip,zulip/zulip,showell/zulip,zulip/zulip,zulip/zulip,rishig/zulip,zulip/zulip,brainwane/zulip,jackrzhang/zulip,zulip/zulip,jackrzhang/zulip,kou/zulip,kou/zulip,dhcrzf/zulip,timabbott/zulip,rht/zulip,andersk/zulip,timabbott/zulip,tommyip/zulip,shubhamdhama/zulip,brainwane/zulip,shubhamdhama/zulip,punchagan/zulip,shubhamdhama/zulip,dhcrzf/zulip,dhcrzf/zulip,hackerkid/zulip,shubhamdhama/zulip,dhcrzf/zulip,brainwane/zulip,tommyip/zulip,punchagan/zulip,dhcrzf/zulip,punchagan/zulip,rht/zulip,andersk/zulip,jackrzhang/zulip,zulip/zulip