better solution for remainder positions less than minimum order size

[kylerberry]

fix for https://github.com/kylerberry/JACT/issues/29

ok, i think this is a better solution. it may require some changes to the manger.info calculations, because the threshold for calculating a 'win' vs a 'loss' is changed.

instead of the bot trying to sell 100% of a position before moving on, it will sell until the remainder is < the minimum order size. this is different for each trading pair. e.g. (.1 for LTC, .01 for ETH). At this point it will allow purchasing to continue. Any remainders from previous sells will be appended onto subsequent sell orders.

I'll open an issue for the info calculation when i have a better idea of how it's been affected.

[coveralls]

Pull Request Test Coverage Report for Build 46

• 20 of 22 (90.91%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.7%) to 55.109%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/PortfolioManager.js	11	13	84.62%
<!--	Total:	20	22	90.91%	-->

Totals
Change from base Build 42:	1.7%
Covered Lines:	237
Relevant Lines:	399

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💛 - Coveralls