Bug in calculating pricing

[namanyayg]

Problem: According to the investInternal method, we're calling PricingStrategy.calculatePrice with first argument as amount sent by wallet in Wei and last argument as number of decimals for a token which is usually 18.

These two amounts are then multiplied again in the actual calculatePrice methods.

Fix: It seems like calculatePrice expects ether value that it can multiply by amount of decimals and divide by the price per token in Wei. Currently, it takes Wei value, multiplies it by decimals (i.e. 10^18), and divides it by price per token in Wei -- we're still left with 18 extra zeros.

If this is correct, then we need to fix the example YAML that lists price in Wei as well.