Improve Rubocop inspections

- Use default config
- Make offences snapshot

The latter suppresses current offences while reports new ones

#579

.rubocop.yml

@@ -1,124 +1 @@
-AllCops:
+inherit_from: .rubocop_todo.yml
-    Exclude:
-    - 'Guardfile'
-    # stuff generated by AR and rails
-    - 'config/deploy-example.rb'
-    - 'config/environments/development-example.rb'
-    - 'config/environments/staging-example.rb'
-    - 'db/schema.rb'
-    - 'db/schema-read-only.rb'
-    - 'db/whois_schema.rb'
-    - 'db/api_log_schema.rb'
-    - 'db/migrate/*'
-    - 'db/data/*'
-    # epp support files until 'complexity issues' will be solved
-    - 'spec/support/epp.rb'
-    - 'spec/support/epp_contact_xml_builder.rb'
-    - 'vendor/bundle/**/*'
-    - 'lib/tasks/import.rake'
-
-Metrics/LineLength:
-  Max: 120 # default 80
-
-Metrics/MethodLength:
-  Max: 25 # default 10
-
-Metrics/ClassLength:
-  Max: 300
-
-Documentation:
-  Enabled: false
-
-Style/Semicolon:
-  AllowAsExpressionSeparator: true
-
-Style/AndOr:
-  Enabled: false
-
-Style/BracesAroundHashParameters:
-  Enabled: false
-
-Style/IndentHash:
-  Enabled: false
-
-# no need to worry about it
-Style/StringLiterals:
-  Enabled: false
-
-# a bit too annoying requirement, no big drawback yet dedected
-Style/TrailingWhitespace:
-  Enabled: false
-
-# a bit too annoying requirement, no big drawback yet dedected
-Style/TrailingBlankLines:
-  Enabled: false
-
-# allow == operator used in void context in specs
-Void:
-  Exclude:
-    - 'spec/**/*'
-
-# allow should == nil in spec
-Style/NilComparison:
-  Exclude:
-    - 'spec/**/*'
-
-# let's save  space in spec
-Style/AlignHash:
-  Exclude:
-    - 'spec/**/*'
-
-# No need to force reduce to use |a, e| as parameters.
-# Configuration parameters: Methods.
-Style/SingleLineBlockParams:
-  Enabled: false
-
-# allow prefix for models and controllers, 
-# otherwise we have to intent all body 4 spaces
-Style/ClassAndModuleChildren:
-  Enabled: false
-
-# Allow to use Estonian terms/data in comments
-Style/AsciiComments:
-  Enabled: false
-
-# turn off comment intention check during development 
-# because NerdCommenter honors commented code intentions
-Style/CommentIndentation:
-  Enabled: false
-
-# It did not alayws suggested good format
-Style/AlignParameters:
-  Enabled: false
-
-# No need fancy style of numbers such as 1_000_000
-Style/NumericLiterals:
-  Enabled: false
-
-# Too often suggest wrong syntax in subarray, this should be fix in rubocop first
-Style/WordArray:
-  Enabled: false
-
-# Ok to use parallel assigment such as: var1, var2 = [], []
-Style/ParallelAssignment:
-  Enabled: false
-
-# not working perfectly or not important enough to care
-Style/EmptyLinesAroundBlockBody:
-  Enabled: false
-
-# The ABC size is a calculated magnitude, so this number can be a Fixnum or a Float.
-Metrics/AbcSize:
-  Max: 35
-
-# Very strange intention requirement, disabled for now
-Style/FirstParameterIndentation:
-  Enabled: false
-
-# old school regex // works fine
-Style/RegexpLiteral:
-  Enabled: false
-
-# annoying to maintain, small thing, no real problem
-Style/SpaceInsideHashLiteralBraces:
-  Enabled: false