v0.5.1 - Command Handler

This is a duplicate release since github tagged the last release as rather weird.

Everything in v0.5.0

• Adds Command Processor
• Migrates existing commands to Command Processor
• Adds list command
• Adds _DIRNAME internal variable to access pacmod directory
• Adds pacmod-core package
• Adds pacmod-commands package
• Adds base package & Import functionality

Existing Gulp functionality will be removed in favor of a Brocolli build system.