Shares schemes of any development pods.

The current user (`ENV['USER']`) is already the default.

This makes it easier to individually build the product of a development
pod from a checked-in project, e.g. when using the pod-template,
allowing for improved sharing with non-CocoaPods users.

[Doc] Improvements and Rake task to lint with inch

Closes #3587.

[pod repo push] Discover and push JSON specs while pushing from a directory

[Resolver] Move side-effect of storing head pods from #specs_by_target

Closes #3494

Ref #3494

Projects opened via pod try are now editable
Closes https://github.com/CocoaPods/cocoapods-try/issues/31

This reverts commit 28c5c44d.

[Config] Add #with_changes

[Downloader] Actually allow skipping the cache entirely

[PodTargetInstaller] Don't generate an umbrella header when a custom mod...

[Installer] Copy Podfile.lock to Manifest.lock rather than using #wri…

[Cache] Fix the cache to handle re-downloads properly

Just remove write permissions from files, so executables are unaffected