…osHeaders

� Conflicts:
�	lib/core/dispatchRequest.js

Refactored accessor building routine;
Refactored default transforms;
Removed `normalizeHeaderName` helper;

…osHeaders

Added missed `has` accessor to TS types;

Added progress capturing ability for node.js environment;
Added `maxRate` option to limit the data rate in node.js environment;
Refactored event handled by `onUploadProgress` && `onDownloadProgress` listeners in browser environment;
Added progress & data rate tests for the http adapter;
Added response stream aborting test;
Added a manual progress capture test for the browser;
Updated TS types;
Added TS tests;
Refactored request abort logic for the http adapter;
Added ability to abort the response stream;

� Conflicts:
�	lib/core/transformData.js
�	lib/defaults/index.js
�	lib/helpers/parseHeaders.js
�	lib/utils.js

Fixed CancelError emitting in streams;

…mption;

Added throwing an error if the request stream was silently destroying (without error) Refers to axios#3966;

…request;

Fixed tests;

Replaced grunt with gulp;
Improved dev scripts;
Added Babel for rollup build;

Added automatic contributors list generator for package.json;