use absolute exclude path in `build/webpack.test.config.js` and fix error when recursively traverse an object#2680

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flytreeleft wants to merge 5 commits intovuejs:devfrom

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Commits on Apr 16, 2016

use absolute path to make sure running tests is OK even if it is in node_modules of other project
flytreeleft
committed
add unit test for circular references detected in Watcher#traverse
flytreeleft
committed
fix 'Maximum call stack size exceeded' when recursively traverse an object
flytreeleft
committed
remove semicolon
flytreeleft
committed
simplify assignment expression
flytreeleft
committed