Added PodSpec

Keeping the podspec file in the repository is not only good practice, it also allows people to reference
their own forks of a repository without maintaining their own custom podspec repository.

DSLCalendarView.podspec

@@ -0,0 +1,18 @@
+Pod::Spec.new do |s|
+  s.name         = "DSLCalendarView"
+  s.version      = "0.0.1"
+  s.summary      = "Simple calendar view for iOS."
+  s.description  = "DSLCalendar view is an iOS control that displays a calendar similar to the system calendar. It allows the user to select a single date or a date range."
+  s.author       = { "Pete" => "pete@dativestudios.com" }
+  s.homepage     = "https://github.com/PeteC/DSLCalendarView"
+  s.screenshots  = "https://github.com/PeteC/DSLCalendarView/raw/images/Screenshot.png"
+  s.license = { :type => 'BSD 3-Clause License', :file => 'README.markdown' }
+  s.source       = { :git => "https://github.com/PeteC/DSLCalendarView.git", :commit => "cd64b97529fd25c3b610c1681e1cfbf301a07cc0" }
+
+  s.requires_arc = true
+  s.platform = :ios, '5.0'
+  s.framework = 'UIKit', 'CoreGraphics'
+
+  s.source_files = 'DSLCalendarView/*.{h,m}'
+  s.resources = "DSLCalendarView/Images/*.png", "DSLCalendarView/*.xib"
+end