v0.3.0

Changes

• Use rust-embed to embed wesbite files into binary. They are unloaded
  to the data_path on startup.
• Pickup template files from data_path/templates with Tera and manage
  with Rocket instead of using Rockets template fairing for Tera.
• Parallelise computational heavy jobs in processing collection with
  Rayon.
• Remove extern crate for macros, import with use instead