added getByZip responses

lib/vote_smart/candidate.rb

@@ -26,7 +26,10 @@ def self.get_by_election election_id
     def self.get_by_district district_id, election_year = nil
       request("Candidates.getByDistrict", "districtId" => district_id, "electionYear" => election_year)
     end
-
+
+    # Returns candidates in the provided zip code, with optional zip+4 and stage
+    def self.get_by_zip zip5, election_year=nil, zip4=nil, stage_id=nil
+      request("Candidates.getByZip", "zip5" => zip5, "electionYear" => election_year, "zip4" => zip4, "stageId" => stage_id)
+    end
   end
-
 end

lib/vote_smart/district.rb

@@ -33,6 +33,10 @@ def self.find_all_by_office_id_and_state_id office_id, state_id
     def self.get_by_office_state office_id, state_id = 'NA', district_name = ''
       request("District.getByOfficeState", "officeId" => office_id, "stateId" => state_id, "districtName" => district_name)
     end
-
+
+    # Returns districts in the provided zip code, with optional zip+4
+    def self.get_by_zip zip5, zip4=nil
+      request("District.getByZip", "zip5" => zip5, "zip4" => zip4)
+    end
   end
 end

lib/vote_smart/election.rb

@@ -17,5 +17,9 @@ def self.get_stage_candidates election_id, stage_id, party = ""
       request("Election.getStageCandidates", "electionId" => election_id, "stageId" => stage_id, "party" => party)
     end
 
+    # Returns elections in the provided zip code, with optional zip+4 and election_year
+    def self.get_by_zip zip5, zip4=nil, election_year=nil
+      request("Election.getElectionByZip", "zip5" => zip5, "zip4" => zip4, "year" => election_year)
+    end
   end
 end

lib/vote_smart/official.rb

@@ -126,6 +126,10 @@ def self.get_by_election election_id
     def self.get_by_district district_id
       request("Officials.getByDistrict", "districtId" => district_id)
     end
-
+
+    # Returns incumbents in the provided zip code, with optional zip+4 and stage
+    def self.get_by_zip zip5, election_year=nil, zip4=nil, stage_id=nil
+      request("Officials.getByZip", "zip5" => zip5, "electionYear" => election_year, "zip4" => zip4, "stageId" => stage_id)
+    end
   end
 end