Fixed session.adatper overwriting session.store

In the configuration, not setting session.adapter overwrites session.store, even when a custom store like redis is used.
Merge pull request #328 from colinwren/master

Add tests for cli generate command, fixed inaccurate comment
Merge pull request #330 from jaredtking/master

Prevented default session.adapter from overwriting custom session.store
Clearer var nomenclature.
Partial fix for local config, stopping to merge pr
Merge branch 'master' of github.com:balderdashy/sails
Added conditional to prevent errors if session.store doesn't exist.
Closes #321