Add 'chromium-args', which can be used to specify chromium
command line args in package.json, fix #307.
Merge pull request #309 from zhchbin/master

Add 'chromium-args'
[test] Simple test case for "chromium-args".
Note: I disable JavaScript I18N API through this API in package.json for test.
Merge pull request #317 from zhchbin/master

Simple test case for "chromium-args".