Merge pull request #34 from Kapin/linter-improvements

Adding a warning for leaving the homepage as default in a podspec.
Merge pull request #35 from Kapin/linter-improvements

Rename run_all_specs_valudation_hooks to run_all_specs_validation_hooks
[gemspec] Sync ActiveSupport dependency with CP gem.
Release 0.27.0
[Bundle] Update
[gemspec] Depend on pure Ruby version of json gem.
Release 0.27.1
[Bundle] Update.
[Specification] Fix gist handling in linter

Gists should be coming from https not git
[Specification] Fix vendored_libraries showing as empty spec