rakefile tweaks
adding EntitySpec
catch interrupt (ctrl-c) for cleaner exit
add source file lists to prompt rebuild upon edit
adding criteria
clarifying parameter for nameChanged delegate

(the delegate is sent the old name value, not the new one)
EntitySpec complete
updating readme to clarify deviations from Ash-as3
Update README.md
Merge pull request #3 from ellemenno/master

adding EntitySpec to test suite