JASMINE_PORT env var is removed; set server_port on Jasmine config

fixes #200

lib/guard/jasmine.rb

@@ -103,6 +103,9 @@ def initialize(options = {})
 
       self.last_run_failed   = false
       self.last_failed_paths = []
+      ::Jasmine.configure do |config|
+        config.server_port = options[:port] if options[:port]
+      end
       @runner = Runner.new(options.merge(run_all_options))
     end
 

lib/guard/jasmine/server.rb

@@ -127,7 +127,7 @@ def start_unicorn_server(port, options)
         #
         def start_rake_server(port, task, options)
           Compat::UI.info "Guard::Jasmine starts Jasmine Gem test server on port #{port}."
-          execute(options, ['rake', task, "JASMINE_PORT=#{port}"])
+          execute(options, ['rake', task])
         end
 
         # Builds a child process with the given command and arguments

spec/guard/jasmine_spec.rb

@@ -49,6 +49,14 @@
         expect(guard.options[:port]).to eql 9999
       end
 
+      it 'port can be set' do
+        mock_config = OpenStruct.new
+        expect(::Jasmine).to receive(:configure).and_yield mock_config
+        guard = Guard::Jasmine.new(port: 12345)
+        expect(guard.options[:port]).to eql 12345
+        expect(mock_config.server_port).to eql 12345
+      end
+
       it 'sets a default :rackup_config option' do
         expect(guard.options[:rackup_config]).to eql nil
       end