fix: set iterator to new contact after adding it

fix: allow time to have not advanced in assert since previous timestamp (time resolution on windows with the time functions we are using may be too low to expect time to have advanced, maybe consider using high-resolution timers later)
[DLN] add a todo for later and minor change to .gitignore
Merge branch 'master' of https://github.com/InvictusInnovations/BitShares
[DLN] change int64 literal to compile on windows