Improve Quick Tour "Big Picture" section and expand Environments docs#2823

Merged

weaverryan merged 3 commits intosymfony:2.2from

jbafford:big-picture-environments-22

Jul 20, 2013

Commits on Jul 4, 2013

Reorganize and expand quickstart big picture docs on environments
jbafford
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Commits on Jul 12, 2013

Big Picture Environments cleanups
jbafford
committed

Commits on Jul 19, 2013

Changes for correctness
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