add variable detection for 'variables' import
update artifact
adjust TODOs
properly get test files.
add detection of arguments for variables
add detection for declared variables
add detection of 'set test variable' keywords in the same definition.
skip lookup of variable when it is a setter
traverse keywords invoked prior to in order to get a global setter.
some cleanup.
handle ${/}
ignore for loops more...
Merge pull request #53 from mtrubs/master

handling of variables