Provide an API to dart:developer to control the web server hosting the Service Protocol

CHANGELOG.md

Index: CHANGELOG.md
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@@ -4,6 +4,28 @@
 
 * Allow `=` as well as `:` as separator for named parameter default values.
 
+### Service protocol changes

[kevmoo, 2016/10/19 22:26:56]

Thanks!

+
+* Accessing the service protocol now requires prefixing paths with an
+authentication token that can be scrapped from standard output.
+
+```
+Old base url:
+
+Observatory listening on http://127.0.0.1:54804/
+
+New base url:
+
+Observatory listening on http://127.0.0.1:54804/<token>/
+
+For example:
+
+Observatory listening on http://127.0.0.1:54804/PTwjm8Ii8qg=/
+```
+
+* The service protocol http server can now be controlled from the 

[kevmoo, 2016/10/19 22:26:56]

Please add this under new `Core library changes` section after the language
section.

See previous releases for an example

+ `dart:developer` library.
+
 ## 1.20.1 - 2016-10-13
 
 Patch release, resolves one issue: