Improved documentation and fixed a typo

• Documentation improvements
  This includes: The use of regular shell expansion, options in front of a shell command and whitespace cleanup.
  Contributed by @michipili (#2)
• Fixed typo in error message This will fix a typo in the error message you'll get when running maphosts without sudo and then killing the application via ctrl+c.
  Contributed by @earthrid (#3)

Bug fixes and improved stability

• Abort application if patched hostsfile will be empty This will improve security of the application. In case the patched hostsfile, we will asume this is a bug on
  our side and warn the user about it instead of destroying
  the users /etc/hosts.
• Fixed HostManager returning string instead of Hosts::File This will fix the wrong status message "Trying again as root" when
  the tool is already running as root.

v1.0

Incremented version to 1.0

Improved error message if empty option is passed

v0.2

Updated version in gemspec