#153 add option to indicate mandatory/optional for additional fields

[Praitheesh]

#153 add option to indicate mandatory/optional in admin panel and validate on ticket reservation page

[coveralls]

Coverage decreased (-0.01%) to 54.271% when pulling bf0636a on Praitheesh:153_optional_mandatory_field into d29ad9d on exteso:master.

[Praitheesh]

@syjer please review and let me know if any changes required. Thanks.

[syjer]

Thanks for the pull request @Praitheesh ! Globally it seems ok, what it's currently missing is the server side validation

[cbellone]

Hi @Praitheesh,

while working on #212 I had to modify the assign-ticket-form page.
Could you please rebase your modifications so that I can merge your pull request, add the server side validation and close #153 ?

Thanks!
Celestino