Update TSS' "loaded file" confirmation check

TSS now has a different confirmation message when it has loaded a file:
"loaded <file>, TSS listening.."

Updated the check in a retroactive way.
Refactored condition in a prettier way
Merge pull request #3 from stevenremot/update-tss-loaded-check

Update TSS "file loaded" check
update test
follow the change of typescript-tools, referred in #2