Version 0.0.5

• Relicensed project under MIT or Apache 2.0 as per Rust crate guidelines (@davidcole1340) 439f2ae
• Added parse_args! macro to simplify argument parsing (@davidcole1340) 45c7242
• Added ability to throw exceptions from Rust to PHP (@davidcole1340) 45c7242
• Added ability to register global constants (@davidcole1340) 472e26e
• Implemented From<ZendHashTable> for Vec (@davidcole1340) 3917c41
• Expanded implementations for converting to Zval from primitives (@davidcole1340) d4c6aa2
• Replaced unit errors with an Error enum (@davidcole1340) f11451f
• Added Debug and Clone implementations for most structs (@davidcole1340) 62a43e6