order class + exchange receiver methods for orderemssage
private data fields, use getters+setters
Merge branch 'master' of https://github.com/FEC-UIUC/FEC-Simulator
This reverts commit 974b33ffacb7427daf7330c8bb08c5dbf8bdb8f9.

Conflicts:

	src/java/Simulator/order.java
Merge branch 'master' of https://github.com/FEC-UIUC/FEC-Simulator