Fix new rubocop warnings

db/migrate/004_user_enhancements.rb

@@ -24,7 +24,7 @@ class UserEnhancements < ActiveRecord::Migration[4.2]
     add_index "user_tokens", ["token"], :name => "user_tokens_token_idx", :unique => true
     add_index "user_tokens", ["user_id"], :name => "user_tokens_user_id_idx"
 
-    User.where("token is not null").each do |user|
+    User.where.not(:token => nil).each do |user|
       UserToken.create(:user_id => user.id, :token => user.token, :expiry => 1.week.from_now)
     end
 

db/migrate/006_tile_nodes.rb

@@ -11,7 +11,7 @@ class TileNodes < ActiveRecord::Migration[4.2]
 
   def self.upgrade_table(from_table, to_table, model)
     if ENV["USE_DB_FUNCTIONS"]
-      execute <<-SQL
+      execute <<-SQL.squish
       INSERT INTO #{to_table} (id, latitude, longitude, user_id, visible, tags, timestamp, tile)
       SELECT id, ROUND(latitude * 10000000), ROUND(longitude * 10000000),
              user_id, visible, tags, timestamp,
@@ -20,7 +20,7 @@ class TileNodes < ActiveRecord::Migration[4.2]
       FROM #{from_table}
       SQL
     else
-      execute <<-SQL
+      execute <<-SQL.squish
       INSERT INTO #{to_table} (id, latitude, longitude, user_id, visible, tags, timestamp, tile)
       SELECT id, ROUND(latitude * 10000000), ROUND(longitude * 10000000),
              user_id, visible, tags, timestamp, 0
@@ -32,7 +32,7 @@ class TileNodes < ActiveRecord::Migration[4.2]
   end
 
   def self.downgrade_table(from_table, to_table)
-    execute <<-SQL
+    execute <<-SQL.squish
     INSERT INTO #{to_table} (id, latitude, longitude, user_id, visible, tags, timestamp)
     SELECT id, latitude / 10000000, longitude / 10000000,
            user_id, visible, tags, timestamp