feat(d3-ext.select-attr) Convenience function to select by attr key/value.
fix(d3-ext.size) Fixed the size(), height(), width() functions to behave as documented.
fix(d3-ext.util) Fixed precedence bug in applyTarget().
refactor() Removed all assumptions of targets, and moved target names to gl-container-name attr.
docs(d3-ext.size) Added some missing private func docs.
Merge pull request #78 from racker/refactor-targets

Refactor targets.