Overflow Analysis TODO Removal

[cintixverum]

Line 127 of MANACrowdsale.sol:

// TODO: possibility of overflow in these operations should be analized

should be removed as there is no possibility of overflow. uint256 can store numbers larger than 10^77.

The line also contains a typo: analized should be analyzed.

It's also worth noting that the interest in the next two lines is calculated linearly instead of exponentially.

[kylerchin]

Stupid Overflow.

[federicobond]

Yes, indeed, the 8% annual inflation is computed based on the supply at the end of the crowdsale and remains constant after that.

Thank you for taking a look at it @cintixverum!