Initial commit
Update README.md
add pom
init core
add base activity impl
impl statements
impl argument and exprssion
update
#2; impl arg/var and location reference; locationRuntime used to impl variable scope;
#4;impl cache metadata
add samples
#4;override cacheMetadata() in statements
#4;#2;impl cacheRootMetadata() and init relationship; define variable scope via locationReferenceEnv
update
#4;impl relationship init in cacheMetadata()
#4;test relationship
update test
update test
remove unused comments
add activityLocationReferenceEnvironment test