**Problem**
StyleSheet's implementation was overly complex. It required
`flattenStyle` to use `expandStyle`, and couldn't support mapping React
Native style props to CSS properties without also exposing those CSS
properties in the API.
**Response**
- `flattenStyle` is concerned only with flattening style objects.
- `StyleSheetRegistry` is responsible for registering styles, mapping
the React Native style prop to DOM props, and generating the CSS for
the backing style element.
- `StyleSheetRegistry` uses a simpler approach to caching styles and
generating style sheet strings. It also drops the unobfuscated class
names from development mode, as the React Dev Tools can provide a
better debugging experience (pending a fix to allow props/styles to be
changed from the dev tools).
- `StyleSheet` will fall back to inline styles if it doesn't think a
style sheet has been rendered into the document. The relationship is
currently only implicit. This should be revisited.
- `StyleSheet` exports `renderToString` as part of the documented API.
- Fix processing of `transformMatrix` and add tests for
`processTransform`.
- Fix `input[type=search]` rendering in Safari by using `display:none`
on its pseudo-elements.
- Add support for `textDecorationLine` and `textAlignVertical`.
- Note the `View` hack to conditionally apply the `flex-shrink:0` reset
from css-layout. This is required because React Native's approach to
resolving `style` is to give precendence to long-hand styles
(e.g., `flexShrink`) over short-hand styles (e.g., `flex`). This means
the `View` reset overrides any `flex:1` declaration. To get around
this, `flexShrink` is only set in `View` if `flex` is not set.
Quick-fix for code-splitting support by updating the rendered style
sheet in place. Reduce the API to `create`, as the rest is now internal
to the framework.
Fix#34
