v0.6.0

• Most of functions covered by specs and docs now
• Removed JSON programming and poison dependency [@saulecabrera, @vforvova]
• Add Faker.Shakespeare [@adam-wanninger]
• Fix SSL issues in Internet.image_url/0 [@zmoshansky]
• Improve tests [@lowks]
• Elixir 1.1 support
• Add Faker.App with author/0, name/0 and version/0
• Add Faker.Address.country_code/0
• Add Faker.Bitcoin with address/0 and address/1
• Add Faker.Color with rgb_hex/0 and rgb_decimal/0