Attempt to Fix #2

Change to how pending orders are handled.
Fix issue with 32 bit integer overflow

Libra v0.2.6 release

Switch to websockets, improve speed of volume weighted average price calculations.
Fix minor error in parsing MarketData endpoint where json overflows.

SHA1(LibraInstaller.msi) = 0902427a4fc161d336d07ca5f7567032f57d0b91

Alpha release

v0.1

v0.1a rc. Still need to track down rate limiting