Add gemspec.
Add improved README.
Add .rvmrc file.
Delete some dirs.
Delete Cask file.
Remove scripts dir.
Remove evm.el.
Add RSpec.
Update README.
Ignore gem files.
Update bin/evm.
Add tmp directory.
Add cli file.
Remove .cask from .gitignore.
Remove tmp dir.
Add exception file.
Add os file.
Refactor spec.
Add use command.
Add bin command.