Added Subspec to require SQLCipher as a dependency.

fmdb.podspec

@@ -10,4 +10,14 @@ Pod::Spec.new do |s|
   s.source_files = 'src/FM*.{h,m}'
   s.exclude_files = 'src/fmdb\.m'
   s.library = 'sqlite3'
+
+  s.subspec 'SQLCipher' do |ss|
+    ss.source_files = 'src/FM*.{h,m}'
+    ss.exclude_files = 'src/fmdb\.m'
+    ss.library = 'sqlite3'
+
+    ss.xcconfig     =  { 'OTHER_CFLAGS' => '$(inherited) -DSQLITE_HAS_CODEC' }
+
+    ss.dependency 'SQLCipher'
+  end
 end