chore(package): remove excessive files from publication
chore(package): remove excessive files from publication

PR #189

.sass-cache, typings ... more take than 500k, half of the package, this is useful to reduces this size when bundling xstream to some extensions, uploading in containers etc. Any way it is good when published package only has what its need and size is lean.

`dist` should stay as may be needed by some bundlers.
staltz/xstream,staltz/xstream,staltz/xstream,staltz/xstream