Better parse error message in gonzales.cssp.node.js

[azproduction]

CSSO 1.3.8

1. Line number in parse error message excludes comment lines and new lines

/* test */
div {
    color: red;
    c
    font-weight: bold;
}

Actual error message: Please check the validity of the CSS block starting from the line #2
Expected Please check the validity of the CSS block starting from the line #4

In huge file one can not simply vi +3 index.css and find the source of problem...

2. Error message could be more informative

It should include full css block with error, and line numbers

Please check the validity of the CSS block starting from the line #4
  2 | div {
  3 |     color: red;
> 4 |     c
  5 |     font-weight: bold;
  6 | }

[robhrt7]

Up. Also, processing many files in a row, it's hard to understand error without the name of broken file.

[olso]

Please

[damiendube]

This is needed!