Fixes typos in directory_spec.rb
Updates file_manipulation_spec.rb for consistency and conciseness
Fixes typos in spec/actions/inject_into_file_spec.rb
Fixes mistake in argument_spec.rb wording
Fixes mistakes in shell/basic_spec.rb wording
Fixes error in shell/html_spec.rb wording
Merge pull request #347 from rthbound/patch-10

Patch 10 - Improves on readability of specs