[EmbedFrameworksScript] Only manually copy swift runtime libs in Xcode 6

Add `tvos` as a new platform

[Analyzer] Build scoped pods once for each target definition

[PodTarget] Filter the scoped dependent_targets to match the target_d…

[Bundle] Update RuboCop to 0.34

[AggregateXCConfig] Set EMBEDDED_CONTENT_CONTAINS_SWIFT when using a …

[Resolver] Give a meaningful message for the case where there is no stable version for a pod, and user do not explicitly specify the required version.

Previous message was not covering the case where there are only pre-release versions between two stable versions, and user specifies version requirements for the pod such that only possibilities satisfying version requirements are pre-release versions. New message format also includes version requirements set by user in order to give a more explanatory output.

Added `source` and valuable flags to Podfile template

Provides a meaningful error message for the dependency conflict occuring when there is no stable version available for a given pod and user do not specify pod version explicitly in Podfile.

While handling resolver error in `handle_resolver_error` method of `resolver.rb` file, we will check if the specificati
on that is not satisfying given requirement was a pre-release version, and if the requirement was including any explicit version or source. If spec is a pre-release version, and there is no explicit version or source for the requirement, we will print a message directing the user to specify pre-release version explicitly.

* commit '2c3185a1':
  [CHANGELOG] Spelling fixes
  [Changelog] Entry for #4219
  Remove SDKROOT relative search path