Update index.md

Correct description of --env option in CLI
added AWS EU-WEST endpoint to references
added AWS EU-WEST endpoint to clouds reference table
added Rackspace London and comment on DFW
changed ordering of cloud endpoints
DFW properly referenced
added US-EAST to original AWS
Merge pull request #375 from goodmike/gh-pages

Correct description of --env option in CLI
attempting fix
update gemfile
Yaron slams it home! Stephenitis with the assist! -- select redcarpet for md
removed -1 from rackspace endpoint
cleaner front page ui
Merge pull request #381 from ysadka/ys-cleanup

Cleaner front page ui
Merge pull request #380 from iron-io/aws-eu-west

Aws eu west
accept fenced code blocks alongside highlights
Merge pull request #382 from ysadka/ys/fencing-md

Accept fenced code blocks alongside highlights
changed syntax blocks to fenced format for redcarpet change
Merge branch 'gh-pages' of https://github.com/iron-io/docs into gh-pages
fixed double newline character in json formatting