Print response from Bittrex's getmarketsummary
test.go without rigid data structure
Deal with different json response types.

So far only handles a maps with string keys, and
arrays.
bittrex.go's get_content() returns a map[string]float64.

The returned data is the golang equivalent of:
{"market_name": ask_price, "market_name2": ask_price2, ...}
Made a poloniex.go which does the same as bittrex.go

...but for poloniex.
Added mintpal.go
Made poloniex.go, bittrex.go, and mintpal.go into pkgs

The over-use of subfolders seems somehow critically
important for the build system.
Fix bittrex.go crash.
Merge pull request #2 from defcronyke/master

poloniex.go, bittrex.go, and mintpal.go packages are ready