Merge branch 'develop'

Gruntfile.js

dist/es5/api-client.js

dist/es5/api-client.min.js

dist/es5/traceur-runtime.min.js

dist/es6/api-client.js

package.json

src/api-client.js

src/api-client/session.js

src/api-client/session/call_center.js

src/api-client/session/call_center/campaigns.js

src/api-client/session/call_center/campaigns/lia.js

src/api-client/session/call_center/email.js

src/api-client/session/call_center/email/accounts.js

src/api-client/session/call_center/email/attachments.js

...-client/session/call_center/email/invite_panel_configs.js

src/api-client/session/call_center/email/templates.js