0.4.0: Wrinkle Release

Lots of cool new/fixed rules in this release. Thanks to @wfleming & @mmorier for their contributions!

Breaking

• API: Rename RuleExample to RuleDescription, remove StyleViolationType and
  combine Rule().identifier and Rule().example into Rule.description.
  JP Simard
  #183

Enhancements

• The VariableNameRule now allows capitalized variable names when they are
  declared static. This allows stylistic usage common in cases like
  OptionSetType subclasses.
  Will Fleming
• Add VariableNameMaxLengthRule and VariableNameMinLengthRule parameter
  rules. Remove length checks on VariableNameRule.
  Mickael Morier
• Add trailing semicolon rule.
  JP Simard
• Add force try rule.
  JP Simard

Bug Fixes

• All rules now print their identifiers in reports.
  JP Simard
  #180
• ControlStatementRule now detects all violations.
  Mickael Morier
  #187
• ControlStatementRule no longer triggers a violation for acceptable use of
  parentheses.
  Mickael Morier
  #189
• Nesting rule no longer triggers a violation for enums nested one level deep.
  JP Simard
  #190
• ColonRule now triggers a violation even if equal operator is collapse to
  type and value.
  Mickael Morier
  #135