Miscellaneous bug fixes (#513)

* Various bug fixes

* Deadlink, cleanup plus bug fixes

* Various Kraken fixes

* Add convert func for decimal unix timestamps

* Convert all test times to UTC

* Kraken: Make assets a pointer to prevent excessive copying

* Docker slash fix

* Address nits plus bump ITBit last checked pairs timestamp

* Set pairs to enabled pairs when getting active orders

* Use asset translator for UpdateAccountInfo and more checks for the exchange template tool

* Address MadCozBadd's nits

* Make exchange var 2 chars

* Make program more user friendly

* Project wide comment checks and exchName check

* Fix Huobi indexing bug and use correct pair formatting

* Address nits + readme change

cmd/documentation/root_templates/root_readme.tmpl

@@ -48,9 +48,10 @@ Join our slack to discuss all things related to GoCryptoTrader! [GoCryptoTrader
 | Yobit | Yes | NA | NA |
 | ZB.COM | Yes | Yes | NA |
 
-We are aiming to support the top 20 highest volume exchanges based off the [CoinMarketCap exchange data](https://coinmarketcap.com/exchanges/volume/24-hour/).
+We are aiming to support the top 30 exchanges sorted by average liquidity as [ranked by CoinMarketCap](https://coinmarketcap.com/rankings/exchanges/). 
+However, we welcome pull requests for any exchange which does not match this criterion. If you need help with this, please join us on [Slack](https://join.slack.com/t/gocryptotrader/shared_invite/enQtNTQ5NDAxMjA2Mjc5LTc5ZDE1ZTNiOGM3ZGMyMmY1NTAxYWZhODE0MWM5N2JlZDk1NDU0YTViYzk4NTk3OTRiMDQzNGQ1YTc4YmRlMTk).
 
-** NA means not applicable as the Exchange does not support the feature.
+** NA means not applicable as the exchange does not support the feature.
 
 ## Current Features