Alfred-pyworkflow

Fix bug 29 where non-ASCII characters in the path to the workflow's directory would cause `Workflow` to fail.

Add `largetext` and `copytext` arguments to `Workflow.add_item()`.

If Script Filter results have a specified `copytext`, this will be copied to the clipboard (instead of `arg`) when CMD+C is pressed on the item.

If results have a specified `largetext`, this will be shown in Alfred's large text pop-up (instead of the query) when CMD+L is pressed on the item.

This will enable Alfred-Workflow to be installed via pip and the bundler.

- Better parsing of HTTP headers
- Better sniffing of HTML/XML document headers
- Better fallback default encodings for common mimetypes

Add improved documentation regarding settings, stored data, background processes

- Add new `Workflow.store_data(name, data)` and `Workflow.stored_data(name)` methods.
- Add `SerializerManager` to enable custom serialization formats for stored and cached data.

Implements 17