Support for streaming large features

This release allows clients with streaming enabled to handle large (> 64kb) features.

Enable streaming by default

Streaming of feature changes is now enabled by default

Minor improvements

Changes the stream subscription URL so that only feature flags are received from the stream.

Support for server-sent events

Added support (disabled by default) for streaming via server-sent events

Add proxy configuration

Added ability to specify an HTTP proxy to use for connections to LaunchDarkly.

Fixed handling of non-string target rules

v0.9.0

bumped version

0.8.2

Make getAnonymous return Boolean, not boolean

0.8.1

Fixes a bug involving default timeouts

0.8.0

Added ability to specify timeouts in milliseconds