gem build warnings

build.log

$ gem build sorcery.gemspec
WARNING:  pessimistic dependency on oauth (~> 0.4.4) may be overly strict
  if oauth is semantically versioned, use:
    add_runtime_dependency 'oauth', '~> 0.4', '>= 0.4.4'
WARNING:  open-ended dependency on bcrypt (>= 3.1) is not recommended
  if bcrypt is semantically versioned, use:
    add_runtime_dependency 'bcrypt', '~> 3.1'
WARNING:  open-ended dependency on abstract (>= 1.0.0, development) is not recommended
  if abstract is semantically versioned, use:
    add_development_dependency 'abstract', '~> 1.0', '>= 1.0.0'
WARNING:  open-ended dependency on rails (>= 3.2.15, development) is not recommended
  if rails is semantically versioned, use:
    add_development_dependency 'rails', '~> 3.2', '>= 3.2.15'
WARNING:  open-ended dependency on json (>= 1.7.7, development) is not recommended
  if json is semantically versioned, use:
    add_development_dependency 'json', '~> 1.7', '>= 1.7.7'
WARNING:  pessimistic dependency on rspec (~> 2.5.0, development) may be overly strict
  if rspec is semantically versioned, use:
    add_development_dependency 'rspec', '~> 2.5', '>= 2.5.0'
WARNING:  pessimistic dependency on rspec-rails (~> 2.5.0, development) may be overly strict
  if rspec-rails is semantically versioned, use:
    add_development_dependency 'rspec-rails', '~> 2.5', '>= 2.5.0'
WARNING:  open-ended dependency on sqlite3 (>= 0, development) is not recommended
  if sqlite3 is semantically versioned, use:
    add_development_dependency 'sqlite3', '~> 0'
WARNING:  pessimistic dependency on yard (~> 0.6.0, development) may be overly strict
  if yard is semantically versioned, use:
    add_development_dependency 'yard', '~> 0.6', '>= 0.6.0'
WARNING:  open-ended dependency on bundler (>= 1.1.0, development) is not recommended
  if bundler is semantically versioned, use:
    add_development_dependency 'bundler', '~> 1.1', '>= 1.1.0'
WARNING:  open-ended dependency on simplecov (>= 0.3.8, development) is not recommended
  if simplecov is semantically versioned, use:
    add_development_dependency 'simplecov', '~> 0.3', '>= 0.3.8'
WARNING:  open-ended dependency on timecop (>= 0, development) is not recommended
  if timecop is semantically versioned, use:
    add_development_dependency 'timecop', '~> 0'
WARNING:  open-ended dependency on mongo_mapper (>= 0, development) is not recommended
  if mongo_mapper is semantically versioned, use:
    add_development_dependency 'mongo_mapper', '~> 0'
WARNING:  pessimistic dependency on mongoid (~> 2.4.4, development) may be overly strict
  if mongoid is semantically versioned, use:
    add_development_dependency 'mongoid', '~> 2.4', '>= 2.4.4'
WARNING:  See http://guides.rubygems.org/specification-reference/ for help
  Successfully built RubyGem
  Name: sorcery
  Version: 0.8.5
  File: sorcery-0.8.5.gem