Extract exporters (#175)

* Remove Stackdriver/Zipkin exporters. Update README

* Update links. Remove google/cloud-trace dev dep.

* Add suggestions for the other exporters

* Fix url to api docs

* Put the mock_error_log back

* guzzle 5 does not have psr7 as a dependency

* Fix GitHub org link for the exporters

Author: chingor13

README.md

@@ -108,8 +108,8 @@ The provided exporters are:
 | [LoggerExporter][logger-exporter] | Exporter JSON encoded spans to a PSR-3 logger | |
 | [NullExporter][null-exporter] | No-op | |
 | [OneLineEchoExporter][one-line-echo-exporter] | Output the collected spans to stdout with one-line | |
-| [StackdriverExporter][stackdriver-exporter] | Report traces to Google Cloud Stackdriver Trace | |
-| [ZipkinExporter][zipkin-exporter] | Report collected spans to a Zipkin server | |
+| [StackdriverExporter][stackdriver-exporter] | Report traces to Google Cloud Stackdriver Trace | [opencensus/opencensus-exporter-stackdriver][stackdriver-packagist] |
+| [ZipkinExporter][zipkin-exporter] | Report collected spans to a Zipkin server | [opencensus/opencensus-exporter-zipkin][zipkin-packagist] |
 
 If you would like to provide your own reporter, create a class that implements
 `ExporterInterface`.
@@ -168,10 +168,12 @@ This is not an official Google product.
 [echo-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/EchoExporter.html
 [one-line-echo-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/OneLineEchoExporter.html
 [file-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/FileExporter.html
-[jaeger-exporter]: https://github.com/census-instrumentation/opencensus-php-exporter-jaeger/blob/master/src/JaegerExporter.php
+[jaeger-exporter]: https://github.com/census-ecosystem/opencensus-php-exporter-jaeger
 [jaeger-packagist]: https://packagist.org/packages/opencensus/opencensus-exporter-jaeger
 [logger-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/LoggerExporter.html
 [null-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/NullExporter.html
-[stackdriver-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/StackdriverExporter.html
-[zipkin-exporter]: https://opencensus.io/api/php/api/master/OpenCensus/Trace/Exporter/ZipkinExporter.html
+[stackdriver-exporter]: https://github.com/census-ecosystem/opencensus-php-exporter-stackdriver
+[stackdriver-packagist]: https://packagist.org/packages/opencensus/opencensus-exporter-stackdriver
+[zipkin-exporter]: https://github.com/census-ecosystem/opencensus-php-exporter-zipkin
+[zipkin-packagist]: https://packagist.org/packages/opencensus/opencensus-exporter-zipkin
 [semver]: http://semver.org/

composer.json

@@ -20,15 +20,18 @@
     "require-dev": {
         "phpunit/phpunit": "^5.0",
         "squizlabs/php_codesniffer": "2.*",
-        "google/cloud-trace": "^0.4",
         "twig/twig": "~2.0 || ~1.35",
         "symfony/yaml": "~3.3",
-        "guzzlehttp/guzzle": "~5.3"
+        "guzzlehttp/guzzle": "~5.3",
+        "guzzlehttp/psr7": "~1.4"
     },
     "conflict": {
         "ext-opencensus": "< 0.1.0"
     },
     "suggest": {
+        "opencensus/opencensus-exporter-jaeger": "Export data to Jaeger",
+        "opencensus/opencensus-exporter-stackdriver": "Export data to Stackdriver",
+        "opencensus/opencensus-exporter-zipkin": "Export data to Zipkin",
         "ext-opencensus": "Enable tracing arbitrary functions.",
         "cache/apcu-adapter": "Enable QpsSampler to use apcu cache.",
         "cache/apc-adapter": "Enable QpsSampler to use apc cache.",