Handle ARCHS coming back as an Array or String
Merge pull request #1652 from carsonmcdonald/fix1628

Handle ARCHS coming back as an Array or String
[Push] Silently test the trunk.cocoapods service
Validation of subspecs

The validation done by `pod spec lint` and `pod lib lint` commands
now checks that all subspecs build independently.

This new behavior can be disabled with `--no-subspecs`.

The validation of a single subspec can be done checked with `--subspec=NAME`.