Fix ambiguous argument warnings

lib/geocoder/cache.rb

@@ -64,7 +64,7 @@ module Geocoder
     # that have non-nil values.
     #
     def keys
-      store.keys.select{ |k| k.match /^#{prefix}/ and interpret(store[k]) }
+      store.keys.select{ |k| k.match(/^#{prefix}/) and interpret(store[k]) }
     end
 
     ##

lib/geocoder/lookups/yahoo.rb

@@ -50,7 +50,7 @@ module Geocoder::Lookup
     # to warning message.
     #
     def parse_raw_data(raw_data)
-      if raw_data.match /^<\?xml/
+      if raw_data.match(/^<\?xml/)
         if raw_data.include?("Rate Limit Exceeded")
           raise_error(Geocoder::OverQueryLimitError) || warn("Over API query limit.")
         elsif raw_data =~ /<yahoo:description>(Please provide valid credentials.*)<\/yahoo:description>/i

lib/geocoder/stores/active_record.rb

@@ -219,7 +219,7 @@ module Geocoder::Store
       end
 
       def using_sqlite?
-        connection.adapter_name.match /sqlite/i
+        connection.adapter_name.match(/sqlite/i)
       end
 
       ##