v2.0.0-beta.15

Bugfixs:

• bugfix(run): modify help info (close #525).
• bugfix(build): fix tslint error.
• bugfix(core): support 304 http request (close #518).
• bugfix(run): don't use xcrun while run android command (close #521).
• bugfix(generator): hide error while the git user can't fetch (close #522).
• bugfix(core): add chromeOpn api.
• bugfix(plugin): add @weex-cli/generator to dependencies (close #513).
• bugfix(core): taobao mirror can work fine on first request (close #518).
• bugfix(core): change https queryurl to http (close #518).
• bugfix(core): add default registry (close #518).
• bugfix(core): fix env config, support npm environment config, such as PUPPETEER_DOWNLOAD_HOST.

Features:

• feat(core): remove template api.
• feat(core): support config.loadConfig api on contex.
• feat(debug): support scan pages on debug page (close #517).

Others:

• workflow(debug): add init scripts.
• workflow(debug): add all inspector source into package.
• workflow(cli): fix cli test.
• workflow(cli): change commit log reg.
• docs(gitpage): finish context api docs.
• docs(gitpage): add documents about the context api.
• docs(githubpage): hide navbar.
• docs(cli): update githubpage.