Send the default value back to LD

Split events_uri into a different configuration parameter

This reverts commit 9182785.

Add missing property declaration

Make Guzzle 5 a suggestion not a requirement

Conflicts:
	composer.lock

Conflicts:
	composer.lock

…erface

Check feature requester passed in options has the required interface

# Conflicts:
#	CHANGELOG.md
#	CONTRIBUTING.md
#	README.md
#	VERSION
#	circle.yml
#	composer.json
#	composer.lock
#	integration-tests/LDDFeatureRequesterTest.php
#	src/LaunchDarkly/Clause.php
#	src/LaunchDarkly/EventProcessor.php
#	src/LaunchDarkly/FeatureFlag.php
#	src/LaunchDarkly/GuzzleFeatureRequester.php
#	src/LaunchDarkly/LDClient.php
#	src/LaunchDarkly/LDDFeatureRequester.php
#	src/LaunchDarkly/Rule.php
#	src/LaunchDarkly/VariationOrRollout.php
#	tests/FeatureFlagTest.php
#	tests/LDClientTest.php
#	tests/OperatorsTest.php

stop trying to do HTTP after we get a 401

issue 5: implement private user attributes in PHP

update PHP 5.3 branch from master

# Conflicts:
#	circle.yml
#	src/LaunchDarkly/GuzzleEventPublisher.php
#	src/LaunchDarkly/GuzzleFeatureRequester.php

update PHP 5.3 branch again