Bool lower case problem

Input

- defaults:
    name: global
    TEST_BOOL_DEFAULT: true
    TEST_STRING_DEFAULT: "/opt/foo"
- parameter:
    name: my_params
    parameters:
      - bool:
          name: TEST_BOOL
          default: "{TEST_BOOL_DEFAULT}"
      - string:
          name: TEST_STRING
          default: "{TEST_STRING_DEFAULT}"
- project:
    name: test
    jobs:
      - job1
      - job2
- job-template:
    name: job1
    parameters:
      - my_params:
- job-template:
    name: job2
    parameters:
      - my_params:
          TEST_BOOL_DEFAULT: false
          TEST_STRING_DEFAULT: "/opt/baz"

output with current master (ed9d0d5e)

16:47 $ jenkins-jobs test htests.yml
WARNING:jenkins_jobs.config:Config file, /etc/jenkins_jobs/jenkins_jobs.ini, not found. Using default config values.
INFO:jenkins_jobs.config:Will use anonymous access to Jenkins if needed.
INFO:jenkins_jobs.cli.subcommand.update:Updating jobs in ['htests.yml'] ([])
WARNING:jenkins_jobs.builder:Unable to retrieve Jenkins Plugin Info from http://localhost:8080/, using default empty plugins info list.
ERROR:root:Problem formatting with args:
allow_empty:False
obj: OrderedDict([('name', 'TEST_BOOL'), ('default', '{test_bool_default}')])
paramdict: OrderedDict([('TEST_BOOL_DEFAULT', False), ('TEST_STRING_DEFAULT', '/opt/baz')])
ERROR:root:Failure formatting component ('bool') data 'OrderedDict([('name', 'TEST_BOOL'), ('default', '{test_bool_default}')])'
Traceback (most recent call last):
  File "/Users/hughsaunders/Documents/context/UG-619/venv/bin/jenkins-jobs", line 10, in <module>
    sys.exit(main())
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/cli/entry.py", line 145, in main
    jjb.execute()
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/cli/entry.py", line 139, in execute
    ext.obj.execute(self.options, self.jjb_config)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/cli/subcommand/test.py", line 55, in execute
    options, jjb_config)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/cli/subcommand/update.py", line 88, in _generate_xmljobs
    xml_jobs = xml_job_generator.generateXML(job_data_list)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/xml_config.py", line 77, in generateXML
    xml_jobs.append(self._getXMLForJob(job))
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/xml_config.py", line 88, in _getXMLForJob
    self._gen_xml(xml, data)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/xml_config.py", line 98, in _gen_xml
    module.gen_xml(xml, data)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/modules/parameters.py", line 908, in gen_xml
    self.registry.dispatch('parameter', pdefs, param)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/registry.py", line 251, in dispatch
    self.dispatch(component_type, xml_parent, b, component_data)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/registry.py", line 169, in dispatch
    self.jjb_config.yamlparser['allow_empty_variables'])
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/formatter.py", line 58, in deep_format
    deep_format(obj[item], paramdict, allow_empty)
  File "/Users/hughsaunders/Documents/context/UG-619/jenkins-job-builder/jenkins_jobs/formatter.py", line 42, in deep_format
    raise JenkinsJobsException(desc)
jenkins_jobs.errors.JenkinsJobsException: test_bool_default parameter missing to format {test_bool_default}
Given:
OrderedDict([('TEST_BOOL_DEFAULT', False), ('TEST_STRING_DEFAULT', '/opt/baz')])