Update podspec and project version to 2.0.0

Summary:
This needs to land and be part of #307 before that gets merged, right?

Part of #306
Closes #308

Differential Revision: D4306594

Pulled By: rnystrom

fbshipit-source-id: 59314d669f2d42f7dc7856249cf53b81ca001466

IGListKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'IGListKit'
-  s.version = '1.0.0'
+  s.version = '2.0.0'
   s.summary = 'A data-driven UICollectionView framework.'
   s.homepage = 'https://github.com/Instagram/IGListKit'
   s.documentation_url = 'https://instagram.github.io/IGListKit'

Source/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0.0</string>
+	<string>2.0.0</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSPrincipalClass</key>