Rename "dummy_mem" feature flag

[emesare]

The feature flag dummy_mem no longer is specific to memory and includes functionality to create dummy os and dummy processes (as of 0.2 version). A good name that works would simply be "dummy".

memflow/memflow/src/lib.rs

Lines 208 to 209 in 9f712ae

	#[cfg(any(feature = "dummy_mem", test))]
	pub mod dummy;