Roll Observatory packages and add a roll script

packages/smoke/CHANGELOG.md

Index: packages/smoke/CHANGELOG.md
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+#### 0.3.5
+  * Update to analyzer '<0.27.0'
+
+#### 0.3.4
+  * Add excludeOverriden to QueryOptions which removes declarations that were
+    overriden within the class hierarchy.
+
+#### 0.3.3+1
+  * Update logging package to `<0.12.0`.
+
+#### 0.3.3
+  * Update to analyzer `<0.26.0`.
+
+#### 0.3.2
+  * Work around an issue running Dart analyzer on the generated code, if the
+    `dynamic` type appeared in the output. Smoke will now use `Object` instead.
+
+#### 0.3.1+1
+  * Updated dependency versions.
+
+#### 0.3.1
+  * Add canAcceptNArgs method.
+
+#### 0.3.0
+  * Change SUPPORTED_ARGS limit for minArgs and maxArgs method from 3 to 15.
+
+#### 0.2.1+1
+  * Fix toString calls on Type instances.
+
+#### 0.2.0+3
+  * Widen the constraint on analyzer.
+
+#### 0.2.0+2
+  * Widen the constraint on barback.
+
+#### 0.2.0+1
+  * Switch from `source_maps`' `Span` class to `source_span`'s `SourceSpan`
+    class.
+
+#### 0.2.0
+  * Static configuration can be modified, so code generators can split the
+    static configuration in pieces.
+  * **breaking change**: for codegen call `writeStaticConfiguration` instead of
+    `writeInitCall`.
+
+#### 0.1.0
+  * Initial release: introduces the smoke API, a mirror based implementation, a
+    statically configured implementation that can be declared by hand or be
+    generated by tools, and libraries that help generate the static
+    configurations.