Add retry on loadRemoteVersion

[edisinovcic]

If version can't be downloaded at first try to retry x times to mitigate errors when solc version cannot be fetched

[edisinovcic]

@axic @chriseth would it make sense to internally try to download x times (where is can be from 2-5 times) version with y seconds delay (where y is between 1 and 5 seconds) so that downloading does not fail?

[cameel]

I would not do it by default but I think it would make sense to have it as an option.