Add test case to verify the definition name and container name
Rename dialog will use this name and scope name returned
Get just the name of the symbol (instead of qualified path) as symbolName of the definition info.
Fixes #652
Renamed assertionMessage to messageAtLastKnownMarker in fourslash
Added test case for rename of enum member using rename api
Merge pull request #817 from Microsoft/renameEnumMember
Fixes the name displayed in the rename dialog to be just symbol name instead of qualified path