Add button to export subscribers to form entries about bonde-clients

[igr-santos]

I need know wich are the columns to know about which info represent.
Insert to label of column fix my problem or can mark wich column i need

[gabrielrtakeda]

Yes sure, but the data coming from api isn't still the correct, for now, it coming just mobilizations data. The subscribers list from form entries has come something like dataclip.

Nome: Lorem, Sobrenome: Ipsum, CIDADE: Outra, CEP: xxxxxxxx, EMAIL: dummy@localhost

That query need to be included on api and create an endpoint do retrieve the correct data. When it returning the correct data, the information about columns will come together, and we can manipulate it on front to create de .xslx file correctly with data reference column name.

[gabrielrtakeda]

The forceDownloadFile actions isn't receiving the filename param and when we'll make the Excel file on makeExcelFile function, we need to export the object values. I'll fix this here.

[igr-santos]

I think need to do export of informations by Widget, doesn't by Mobilization, because one mobilization has many FormWidget and each FormWidget has many lines of information

[gabrielrtakeda]

Needs to handle the behaviour when detects that browser is Safari, because Safari isn't support a[download] attribute yet (check a[download] attribute supported browsers). For that, i opened a PR (rndme/download#33) to make downloadjs module accepts an option object and we pass a function in options.safariCallback() to overwrite the current behaviour to Safari.

While the PR isn't merged, i'll point the downloadjs module dependency on hub-client repo to my forked repository. What do you think?

[gabrielrtakeda]

Need to fix "Salvar planilha" button onclick method to avoid mistaken clicks and change button's background color to outlined style.