[LockingDependencyAnalyzer] Unlock pods in a case-insensitive manner

Closes https://github.com/CocoaPods/CocoaPods/issues/2992.

CHANGELOG.md

@@ -48,6 +48,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Xavi Matos](https://github.com/CalQL8ed-K-OS)
   [#3002](https://github.com/CocoaPods/CocoaPods/issues/3002)
 
+* `pod update PODNAME` will update pods in a case-insensitive manner.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#2992](https://github.com/CocoaPods/CocoaPods/issues/2992)
+
 ##### Bug Fixes
 
 * Added support for .tpp C++ header files in specs (previously were getting

lib/cocoapods/installer/analyzer/locking_dependency_analyzer.rb

@@ -33,8 +33,8 @@ module Pod
             end
 
             pods_to_update = pods_to_update.flat_map do |u|
-              root_name = Specification.root_name(u)
-              dependency_graph.vertices.keys.select { |n| Specification.root_name(n) == root_name }
+              root_name = Specification.root_name(u).downcase
+              dependency_graph.vertices.keys.select { |n| Specification.root_name(n).downcase == root_name }
             end
 
             pods_to_update.each do |u|

spec/unit/installer/analyzer_spec.rb

@@ -159,6 +159,13 @@ module Pod
         @analyzer.send(:locked_dependencies).to_a.map(&:payload).should == []
       end
 
+      it 'unlocks dependencies in a case-insensitive manner' do
+        @analyzer.update =  { :pods => %w(JSONKit) }
+        @analyzer.analyze
+        @analyzer.send(:locked_dependencies).map(&:payload).map(&:to_s).
+          should == ['SVPullToRefresh (= 0.4)']
+      end
+
       it 'unlocks all dependencies with the same root name in update mode' do
         podfile = Podfile.new do
           platform :ios, '8.0'