minor refactoring 'user_interface.rb'
[Command::Spec] Fix crash

Closes https://github.com/CocoaPods/CocoaPods/issues/1543
Merge pull request #2479 from CocoaPods/fabio/fix-pod-spec-create-crash

[Command::Spec] Fix crash
Merge pull request #2493 from laiso/missing_spec

minor refactoring 'user_interface.rb'
[Installer] Only show preparing message in verbose mode
[Analyzer] Clarify the deprecation message of implicit sources

Thanks @alloy
[spec] Make green.
[Resolver] Removed unused sort_by method call
[Analyzer] Only update source repos that are being used
[SourcesManager] Print `repo add` output.

This is a temporary hack, do we need to formalize this and how?
[SourcesManager] Tweak message when adding repo via URL fails

Thanks @alloy
[CHANGELOG] Update for 0.34.0
[CHANGELOG] Use a real spec-repo for illustration purposes.
Use artsy specs repo as example
[gemspec] Bump xcodeproj to 0.19.2
Bump to 0.34.0
[bundle] update
[README] Minor cleanup
Merge pull request #2524 from jhersh/master

Minor README cleanup
[pod setup] Remove write access option

This is no longer relevant with trunk

Closes #2519