Merge pull request muZZkat#25 from mikrobi/master

Replace handle images with proper shadow effects.
Added Podspec

Author: muZZkat

NMRangeSlider.podspec

@@ -0,0 +1,13 @@
+Pod::Spec.new do |s|
+  s.name         = "NMRangeSlider"
+  s.version      = "1.1.1"
+  s.summary      = "A custom range slider for iOS."
+  s.homepage     = "https://github.com/muZZkat/NMRangeSlider"
+  s.license      = 'MIT'
+  s.author       = { "Murray Hughes" => "[email protected]" }
+  s.source       = { :git => "https://github.com/mikrobi/NMRangeSlider.git" }
+  s.platform     = :ios
+  s.source_files = 'NMRangeSlider/*.{h,m}'
+  s.requires_arc = true
+  s.resources = "NMRangeSlider/DefaultTheme/*.png", "NMRangeSlider/DefaultTheme7/*.png", "NMRangeSlider/MetalTheme/*.png"
+end