Resolve "Grammar Bugs (VariableArityParameter and multiple catch types)"

Closes #21 (closed)

src/main/grammar/Grammar.flex

@@ -18,7 +18,7 @@ import com.intellij.psi.TokenType;
 
 
 WhiteSpace        = [ ] | \t | \f | \n | \r | \r\n
-ID                = [a-zA-Z$_][a-zA-Z0-9$_]*
+ID                = [:jletter:] [:jletterdigit:]*
 MultiLineComment  = [/][*][^*]+[*]+([^*/][^*]*[*]+)*[/]
 DocComment        = [/][*][*][^*]*[*]+([^*/][^*]*[*]+)*[/]
 SingleLineComment = [/][/] [^\n\r]* (\n | \r | \r\n)