Convert the `pod podfile_info` command to a plugin

This removes the podfile_info functionality from cocoapods.

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`.

Handle ARCHS coming back as an Array or String

added social media url to the template fixes #1648

Enhance pod lib lint to support multiple Spec files in the folder

Add regexp search capabilities to full text search and lower memory usage.

https://github.com/joyent/libuv/blob/master/CONTRIBUTING.md

Closes #1568

Fix `pod search` when the silent flag is enabled

[Bazaar] Add Bazaar support