Building gem yields several warnings

[miguelaferreira]

Review warnings and fix appropriately.
Some dependencies like fog could actually be upgraded.

> gem build vagrant-cloudstack.gemspec 
WARNING:  description and summary are identical
WARNING:  pessimistic dependency on fog (~> 1.22.0) may be overly strict
  if fog is semantically versioned, use:
    add_runtime_dependency 'fog', '~> 1.22', '>= 1.22.0'
WARNING:  open-ended dependency on rake (>= 0, development) is not recommended
  if rake is semantically versioned, use:
    add_development_dependency 'rake', '~> 0'
WARNING:  pessimistic dependency on rspec-core (~> 2.14.7, development) may be overly strict
  if rspec-core is semantically versioned, use:
    add_development_dependency 'rspec-core', '~> 2.14', '>= 2.14.7'
WARNING:  pessimistic dependency on rspec-expectations (~> 2.14.4, development) may be overly strict
  if rspec-expectations is semantically versioned, use:
    add_development_dependency 'rspec-expectations', '~> 2.14', '>= 2.14.4'
WARNING:  pessimistic dependency on rspec-mocks (~> 2.14.4, development) may be overly strict
  if rspec-mocks is semantically versioned, use:
    add_development_dependency 'rspec-mocks', '~> 2.14', '>= 2.14.4'
WARNING:  See http://guides.rubygems.org/specification-reference/ for help
  Successfully built RubyGem
  Name: vagrant-cloudstack
  Version: 1.0.0
  File: vagrant-cloudstack-1.0.0.gem