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This enables the return value to be moved, rather than copied.

Node::force_insert() uses convert<> to convert its key to a node.
Add a specialization for convert<Node>.

Removed the boost requirement from memory.h using the shared_memory type defined in ptr.h

"const Node Node::operator[](const Key& key) const" changed from
returning new empty node if the key was missing in 0.5.1 to returning
a shared 'zombie' node in 0.5.2 to resolve a memory leak.

(Specifically 1025f76d was where this
was introduced)

This caused some regressions where this 'zombie' object threw exceptions
in some functions where the 'empty' object would not.

This change fixes the Node::as(fallback) method (to return the
'fallback' instead of throwing an exception) and the
Node::begin()/Node::end() methods to return default-constructed
iterators (so begin() == end() in such cases) instead of another
exception.

Initial description of style, tests, and pull request process.

Fix compiler error by updating node_data::remove to use new equals() method.

- Update the call to equals() in node_data::remove() to match the new implementation
- Add unit test for node::remove() to catch this type of bug in the future

Add more error messages that include the location in a parsed file.

Applied the patch given in jbeder/yaml-cpp#200 with the correct code
style.

Add a .gitignore file.

Ignore the CMake build directory.

Fixed linker error on Visual Studio with a shared lib by moving the static methods node_data::equals to an instance method on node.