Make coverage reporting work with coveralls

.simplecov

@@ -1,4 +1,19 @@
+require 'simplecov-lcov'
+
+SimpleCov::Formatter::LcovFormatter.config do |c|
+  c.output_directory = 'coverage'
+  c.lcov_file_name = 'lcov.info'
+  c.report_with_single_file = true
+end
+
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([
+  SimpleCov::Formatter::HTMLFormatter,
+  SimpleCov::Formatter::LcovFormatter
+])
+
 SimpleCov.start do
   add_filter 'spec/'
   add_filter 'features/'
+
+  enable_coverage :branch
 end

Gemfile

@@ -8,8 +8,8 @@ group :test do
 end
 
 group :coverage do
-  gem 'simplecov', :require => false, :platforms => :ruby
-  gem 'coveralls', :require => false if ENV['CI']
+  gem 'simplecov', require: false
+  gem 'simplecov-lcov', require: false
 end
 
 group :debug do