Add currency pairs api call and lazy init results.
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	xchange-bter/src/main/java/com/xeiam/xchange/bter/service/polling/BTERPollingTradeServiceRaw.java
Fix currency pair deserializer to handle symbols > 3 char.
Merge pull request #335 from jamespedwards42/develop

Lazy Init Exchange Symbols From Server Instead Of Static Config
Fix currency from USD to BTC as base currency of orders
Merge pull request #336 from jheusser/fix_cex_lob

Cex: Fix currency from USD to BTC as base currency of orders
issue #337 get rid of BigMoney, redundant currency field - core
delete mtgox module - good riddance!
issue #337 get rid of BigMoney, redundant currency field - bitcoinaverage
issue #337 get rid of BigMoney, redundant currency field - bitcoincharts
issue #337 get rid of BigMoney, redundant currency field - bitcoinium
issue #337 get rid of BigMoney, redundant currency field - bitcurex
Replace BigMoney with CurrencyPair
Merge remote-tracking branch 'upstream/issue_337' into issue_337
issue #337 Replace BigMoney with CurrencyPair
issue #337 get rid of BigMoney, redundant currency field - bitfinex
Merge branch 'issue_337' of github.com:timmolter/XChange into issue_337
issue #337 get rid of BigMoney, redundant currency field - bitstamp
issue #337 Replace BigMoney with CurrencyPair
issue #337 get rid of BigMoney, redundant currency field - btcchina