Merge pull request #1 from lohki/master

Corelational list between old images and new icons.
Merge pull request #2 from lohki/master

Updating the tool
- Refactor into command and subcommands
- Fix the Fontawesome 4 map, it is not just adding fa-
implement
  bootstrap-tables (eg. details -> table)
  fa-upgrade (fixes existing icons)
added process_toolbar function to fa_update.rb