Improve rubocop

Update rubocop and add rubocop settings

.rubocop.yml

@@ -0,0 +1,8 @@
+inherit_from: .rubocop_todo.yml
+
+AllCops:
+  Include:
+    - '**/Rakefile'
+  Exclude:
+    - 'bin/**/*'
+    - 'spec/**/*'

.rubocop_todo.yml

@@ -0,0 +1,18 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2016-04-26 11:10:05 -0500 using RuboCop version 0.39.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 1
+Lint/HandleExceptions:
+  Exclude:
+    - 'lib/fuzzy_where.rb'
+
+# Offense count: 3
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 86

lib/fuzzy_where/active_record_model_extension.rb

@@ -5,20 +5,20 @@ module FuzzyWhere
   # Methods to extend ActiveRecord
   module ActiveRecordModelExtension
     extend ActiveSupport::Concern
-    
+
     define_method(FuzzyWhere.config.where_method_name) do |conditions|
       conditions ||= {}
       validate_conditions(conditions)
       FuzzyRelationBuilder.new(quoted_table_name, where(nil), conditions)
-        .build
+                          .build
     end
 
     private
 
     def validate_conditions(conditions)
       return if conditions.respond_to?(:key)
-      fail ArgumentError,
-           "conditions must be a Hash, got #{conditions.inspect}"
+      raise ArgumentError,
+            "conditions must be a Hash, got #{conditions.inspect}"
     end
   end
 end

lib/fuzzy_where/config.rb

@@ -41,7 +41,7 @@ class Configuration #:nodoc:
     # @return [Hash] fuzzy predicate definition
     def fuzzy_predicate(key)
       @fuzzy_predicates = load_yml(predicates_file)
-      @fuzzy_predicates["#{key}"]
+      @fuzzy_predicates[key.to_s]
     end
 
     private
@@ -50,14 +50,14 @@ def fuzzy_predicate(key)
     # @param path [Object] predicates definition location
     # @return [Hash] fuzzy predicate definitions
     def load_yml(path)
-      fail ConfigError, 'The configuration file is not defined.' unless path
+      raise ConfigError, 'The configuration file is not defined.' unless path
       file = path.is_a?(Pathname) ? path : Pathname.new(path)
       if !file.exist?
-        fail ConfigError, "The configuration file #{path} was not found."
+        raise ConfigError, "The configuration file #{path} was not found."
       elsif !file.file?
-        fail ConfigError, "The configuration file #{path} is not a file."
+        raise ConfigError, "The configuration file #{path} is not a file."
       elsif !file.readable?
-        fail ConfigError, "The configuration file #{path} is not readable."
+        raise ConfigError, "The configuration file #{path} is not readable."
       end
       HashWithIndifferentAccess.new(YAML.load_file(file))
     end

lib/fuzzy_where/fuzzy_relation_builder.rb

@@ -70,13 +70,13 @@ def process_conditions
 
     def load_fuzzy_predicate_definition(predicate)
       pred_def = FuzzyWhere.config.fuzzy_predicate(predicate)
-      fail FuzzyError, "couldn't find fuzzy definition" unless pred_def
+      raise FuzzyError, "couldn't find fuzzy definition" unless pred_def
       pred_def
     end
 
     def derivate_condition(column, pred_def)
       FuzzyDerivation.new(@relation, @table, column, pred_def)
-        .derivative_condition
+                     .derivative_condition
     end
 
     def membership_degree_function(column, pred_def)