Improve email ordering

[jerry-peng]

Issue #85

Changes:

• Removed a newline character so the data comes right after the keyword and the colon.
• Created fields_to_join_name field to configure field name for joined data
• Upper case titles are sorted in their lowercase value
• Added new test for fields_to_join_name values
• Documentation updated, with fields_to_join and fields_to_join_name section for form_setup.rst

The keywords are already programmed to sort keys when I was fixing it.