avoid directory throw error when assets move to remote.

update local test extension for 3.5.0

replace remote address in manifest.

remove remote assets from master branch.

Merge pull request #48 from xianyinchen/350-Output-Directory

Update hook.js

Merge pull request #47 from xianyinchen/adapted-to-3.5

Update hook.js

Merge pull request #45 from xianyinchen/3.0.0

Upgrade to 3.3.1

Merge pull request #38 from xianyinchen/3.0.0

update doc.

fix syntax issues.

Merge pull request #37 from xianyinchen/3.0.0

add missing files and update to the latest version.