setup-non-vagrant: Document how to setup zulip dev env on cloud9.
setup-non-vagrant: Document how to setup zulip dev env on cloud9.

Significantly tweaked by tabbott for instructional clarity.

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