Job id duplicate fix

Changed how job id's are created to avoid the same id to be assigned to
two concurrent jobs.
Added system property refine.max_form_content_size

To allow configuring the maximum allowed form content size in Jetty.
Put ISO8601_FORMAT into ThreadLocal to fix the concurrency issue
Merge pull request #881 from zsxwing/simple-date-format-bug

Put ISO8601_FORMAT into ThreadLocal to fix the concurrency issue
Merge pull request #876 from Arcadelia/Apply-operations_Form-too-large

Added system property refine.max_form_content_size
Merge pull request #852 from Arcadelia/Duplicate-job-id-fix

Import job duplicate id fix
Wrap conditional statement in block
Ignore bin directory