isolating configuration
Merge pull request #131 from bolandrm/refactor_config

isolating configuration
Remove superfluous quotes
Remove show_cops_on_duty
Use sensible default configuration

If there is no file/dir specific configuration file present fallback to
the one bundled with RuboCop. This fixes #126.
Display different message for attr_reader/writer
Don't interpret :alias as `alias` keyword
Simplify cop logic
Extract some specs which are related to project rather than CLI
Run CLI specs in isolated environment

Previously, the specs were run in the project directory.
This fixes #119.
Fix odd indentations
Remove unnecessary test directory creation
Change FileHelper#create_file to add line feed to end of file
Refactor CLI specs with FileHelper#create_file
read_source cleanup
Merge pull request #134 from jurriaan/better-read_source

read_source cleanup
Merge pull request #135 from yujinakayama/refactor-cli-spec

Refactor CLI spec