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add background.test.js
update jasmine to v2.0
modify jasmine boot.js to manually run instead of onload
add background shifttab functions and test
Revert "update manifest"

This reverts commit 423c292ba4d24f08139cb240c150d85bec20b3be.
Revert "update jasmine to v2.0"

This reverts commit 0873db4cf100d46da485bd26a738b7a23cca03fc.
Merge branch 'dev'