Don't allow `pod lib create` to continue with a space in the pod name

Fixed a crash which was causing a failure in `pod lib create` if the name of
the Pod included spaces. As spaces are not supported now this is gracefully
handled with an informative message.

Fixes #1456
[Xcodeproj] Bump
[Installer] Configure ARC on all build configurations of the Pods proj.

Closes #1454
[Analyzer] Inspect the architecture of the user project if needed.

See #1450
[Fixtures] Update
[Changelog]
[Gemspec] Bump Xcodeproj
Release 0.26.2