load config file automaticaly

order:
- ENV['COFFEELINT_CONFIG']
- config/coffeelint.json
- ~/coffeelint.json
- ~/.coffeelint.json
update for rspec-3.x
Allow using custom version of coffeelint.js
Merge pull request #16 from masarakki/rspec3

update for rspec-3.x
Merge pull request #15 from masarakki/load_config_file

load config file automaticaly
Merge pull request #17 from mwean/master

Allow using custom version of coffeelint.js
Update to coffeelint v1.6.1

Up version to 0.4.0