[Bundle] Update cocoapods-dependencies to 0.4.0
[HooksManager] Show the name of the source for each hook that is run in verbose mode

Huge thanks to @alloy for the `source_location` hint!

The name calculation is wrapped in a lambda so it's not called when it won't be printed out
Allow the specification of plugins in the podfile
[CHANGELOG] Add entry for podfile specification of plugins
[HooksManager] Fix whitelisted plugins hooks not fired

We're incorrectly comparing the hook name instead of the plugin name in
the whitelist
[HooksManager] Change order of arguments for register

“Register slather for post install” vs “Register for post install
slather”
Update integration fixtures
Merge pull request #2830 from CocoaPods/seg-hooks-plugin-name

[HooksManager] Show the name of the source for each hook that is run in verbose mode
[Gemfile] Move Core back to master
[CONTRIBUTING] Fix minor typos
Fix case used for GitHub
[Error Report Spec] Update copy
Revert "[Rake] Check required binaries"

This reverts commit 581eb06a0aec59df0b0c5ab79113cfea970d0a62.

Conflicts:
	Rakefile
[spec] Disable tests that require mercurial to be installed if it's not.

You'll see output at the end of a run like:

```
[!] Skipping test due to missing `hg` executable: Installs a Pod with different subspecs activated across different targets

[!] Skipping test due to missing `hg` executable: Installs a Pod with an external source
```
[rake] Make more resilient against not having installed bundle.
[rake] Do not scare user when running `rake bootstrap`.
Fix rubocop issues within the Rakefile
[Resolver] Ensure Informative errors are always shown for platform incompatibilities

Closes https://github.com/CocoaPods/CocoaPods/issues/2868
[Bundle] Update Molinillo
[IntegrationSpecs] Update fixtures for Molinillo debug output going to STDOUT