1.5.0

• [fix] Fix query string management (#943)
• [chore] Add gulp & babel in the build process (#940)
• [chore] Add eslint (#951)
• [chore] bump zuul (#958)
• [chore] Remove jspm browser config (#957)
• [chore] Update zuul browser settings following EOL notices (#985)
• [chore] Bump zuul to 3.11.0 & zuul-ngrok to 4.0.0 (#997)
• [chore] reference build badge to master branch (#967)
• [chore] Bump engine.io-client to 1.7.0 (#996)
• [chore] Restrict files included in npm package (#998)