1.7.0

• [fix] Revert "default rejectUnauthorized to true" (#496)
• [fix] Use xhr.responseText if xhr.response is not provided (#483)
• [fix] Fix issue with errors during WebSocket creation not being caught (#475)
• [style] Add missing semi-colon (#501)
• [chore] Add gulp & babel in the build process (#455)
• [chore] Add eslint (#458)
• [chore] Bump zuul (#464)
• [chore] Remove unused submodule (#466)
• [chore] Bumping ws to 1.1.1 (#478)
• [chore] Update zuul browser settings following EOL notices (#486)
• [chore] Bump engine.io-parser (#492)
• [chore] Make the build status badge point towards master (#497)
• [chore] Bump zuul to 3.11.0 & zuul-ngrok to 4.0.0 (#498)
• [chore] Restrict files included in npm package (#499)