enable configuring of nodejs https options
Polish #74 from @wwwdata

- renamed 'request.httpsOptions' to 'request.mixins' for consistency with the XHR client
- added tests, now testing https requests
- added property to client docs
- added to README release notes
Support Browserify

- avoid references to 'this' as the global object, as browserify makes
  this undefined instead of the global
- also removing unchecked references to 'window'

See: https://github.com/substack/node-browserify/issues/372
Release v1.1.1
Bump version for development
Add multipart/form-data mime support
Polishing PR #77

- updating README and docs
Add support for binary response entities
Merge branch 'binary-response' into dev

Conflicts:
	test/client/xhr-test-browser.js