Migrating wiki contents from Google Code

BreakingChanges.md

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+# The following is a list of breaking changes to yaml-cpp, by version #
+
+# New API #
+
+## 0.5.2 ##
+
+_none_
+
+## 0.5.1 ##
+
+  * `Node::clear` was replaced by `Node::reset`, which takes an optional node, similar to smart pointers.
+
+## 0.5.0 ##
+
+Initial version of the new API.
+
+# Old API #
+
+## 0.3.0 ##
+
+_none_
+
+## 0.2.7 ##
+
+  * `YAML::Binary` now takes `const unsigned char *` for the binary data (instead of `const char *`).
+
+## 0.2.6 ##
+
+  * `Node::GetType()` is now `Node::Type()`, and returns an enum `NodeType::value`, where:
+> > ` struct NodeType { enum value { Null, Scalar, Sequence, Map }; }; `
+  * `Node::GetTag()` is now `Node::Tag()`
+  * `Node::Identity()` is removed, and `Node::IsAlias()` and `Node::IsReferenced()` have been merged into `Node::IsAliased()`. The reason: there's no reason to distinguish an alias node from its anchor - whichever happens to be emitted first will be the anchor, and the rest will be aliases.
+  * `Node::Read<T>` is now `Node::to<T>`. This wasn't a documented function, so it shouldn't break anything.
+  * `Node`'s comparison operators (for example, `operator == (const Node&, const T&)`) have all been removed. These weren't documented either (they were just used for the tests), so this shouldn't break anything either.
+  * The emitter no longer produces the document start by default - if you want it, you can supply it with the manipulator `YAML::BeginDoc`.
+
+## 0.2.5 ##
+
+This wiki was started with v0.2.5.