add the name of the environment to the session cookie name so people don't eg. get logged out of production when they log in to staging
don't append environment if production
Merge pull request #1051 from code-dot-org/finished

finished -> levelbuilder
Automatically built
Merge pull request #1053 from code-dot-org/finished

finished -> levelbuilder
Merge pull request #1048 from code-dot-org/env-name-session-cookie

add the name of the environment to the session cookie name
Commit current state of levelbuilder
Merge pull request #1054 from code-dot-org/level-builder

Level builder -> finished
Merge pull request #1055 from code-dot-org/finished

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