1.5.0.beta.1

Enhancements

• Add ability to lockfile to retrieve spec repo for pod name
  Dimitris Koutsogiorgas
  #434

• HTTP::perform_head_request now includes a 1-byte Range header in the fallback GET
  request.
  Kyle Fleming
  #425

• Update Podfile Reference Guide to include :source parameter for the pod statement
  Mark Woollard
  #7359

• Allow enabling modular headers for pods in the Podfile.
  Samuel Giddins

Bug Fixes

• Fix crash when there's an empty source spec directory
  Paul Beusterien
  CocoaPods#6381

• The Dependency#merge method takes into account any podspec_repos the dependencies
  may have set.
  Samuel Giddins

• When evaluating .podspec files, ensure that __FILE__ refers to the correct file.
  Samuel Giddins

• Serialize lockfiles that contain Pods with non-alphanumeric characters
  (such as !) properly.
  Samuel Giddins
  CocoaPods#7302