v0.13.0

Breaking

• Make the tree API return an object instead of array (21ffabf) - Closes #24

Fix

• Support task aliases (25c2a90)
• Ignore leaked global from sparkles (818450b)
• Remove conditional use of es6-weak-map (7f076bd)

Update

• Add test for a custom registry's set method returning undefined (274e723)

Docs

• Add list of custom registries (d61dcfa) - Closes #35
• Cleanup some examples (c09f665)
• Fix link locations (afdd5ee)

Upgrade

• Update undertaker-registry and dev dependencies (5aa1ce8) - Closes #18
• Bump es6-weak-map & dev dependencies (299dd47)

Build

• Add eslint and jscs presets & update code (0c3fe1c)
• Run travis on more node versions (65e232b)