Fix for Issue #16. If a method is marked pausable, but doesn't make any pausable calls, then the prelude was being generated incorrectly: the fiber argument was loaed onto the stack, but not popped on return.

	modified:   src/kilim/analysis/MethodWeaver.java
	modified:   test/kilim/test/ex/ExBasicBlock.java
Merge remote-tracking branch 'upstream/master' into patches/latest