Update version to 0.4.3

Recognize full Unicode alphanumerics in doc slugs

Fixes #37

Add v0.4.1 items to changelog

Update README and bump version number to 0.4.0

Remove unused TinyMCE components

Update version and readmes

Update changelog and bump version number

Merge pull request #21 from documentcloud/oembed

Generate embed codes through DocumentCloud's oEmbed endpoint