Fixes for issue 103 and 132

[itailiors]

Implement Rescan Functionality with Data Clearing for Founder Projects #103
And fix for invest page time and functionality #132
(@dangershony or @DavidGershony there's a TODO comment because i wasn't sure what is expected,
"//TODO: what should the order be here? if an investor has a signed trx that he has not invested yet, and the project has started, could he invest?" "

also i think there is another case of someone requesting to invest, and the founder hasn't signed until after the start date

[itailiors]

also added #137 small fix

[dangershony]

if an investor has a signed trx that he has not invested yet, and the project has started, could he invest?"

I think yes we should allow, perhaps we could displa a warning and add a limitation that if stage 1 has passed then no possibility to invest anymore.

@miwahn what do you think?

[dangershony]

@DavidGershony this is for you to review

[itailiors]

#132 is still TBD right now it is "disabled" from the view page,
but if you change the URL you can still invest (and there is nothing else restricted)

[DavidGershony]

Why do we clear the data we already have?

[dangershony]

I agree I will remove this lines

[itailiors]

@dangershony @DavidGershony I added this because of the rescan feature,
now if you rescan there are duplicates.

maybe theres a better solution instead of deleting, to just add the ones that are different (we will also need to add logic for the same project being changed on another client)

[itailiors]

depending on your answer, i'll open a PR with the according fix