Statistic logging for gzip compression is misleading

The current statistic output for gzip compression makes it appear as though the original file is being gzipped, where as it is actually the minified (or otherwise copied) version.
```
[INFO] ie.css (1376b) -> ie-min.css (624b)[45%]
[INFO] ie.css (1376b) -> ie-min.css.gz (362b)[26%]
[INFO] ie6.css (0b) -> ie6-min.css (0b)[100%]
[INFO] ie6.css (0b) -> ie6-min.css.gz (20b)[2000%]
[INFO] ie7.css (468b) -> ie7-min.css (263b)[56%]
[INFO] ie7.css (468b) -> ie7-min.css.gz (149b)[31%]
[INFO] ie9.css (177b) -> ie9-min.css (45b)[25%]
[INFO] ie9.css (177b) -> ie9-min.css.gz (46b)[25%]
```

More correct would be to use the outFile's name and filesize (the gzipped percentage is a ratio of the minified size):
```
[INFO] ie.css (1376b) -> ie-min.css (624b)[45%]
[INFO] ie-min.css (624b) -> ie-min.css.gz (362b)[58%]
[INFO] ie6.css (0b) -> ie6-min.css (0b)[100%]
[INFO] ie6-min.css (0b) -> ie6-min.css.gz (20b)[2000%]
[INFO] ie7.css (468b) -> ie7-min.css (263b)[56%]
[INFO] ie7-min.css (263b) -> ie7-min.css.gz (149b)[57%]
[INFO] ie9.css (177b) -> ie9-min.css (45b)[25%]
[INFO] ie9-min.css (45b) -> ie9-min.css.gz (46b)[102%]
```

This pull request instead condenses these to a single line (the gzipped percentage is a ratio of the original size):
```
[INFO] ie.css (1376b) -> ie-min.css (624b)[45%] -> ie-min.css.gz (362b)[26%]
[INFO] ie6.css (0b) -> ie6-min.css (0b)[100%] -> ie6-min.css.gz (20b)[2000%]
[INFO] ie7.css (468b) -> ie7-min.css (263b)[56%] -> ie7-min.css.gz (149b)[31%]
[INFO] ie9.css (177b) -> ie9-min.css (45b)[25%] -> ie9-min.css.gz (46b)[25%]
```

And when nocompress=true:
```
[INFO] ie.css (1376b) -> ie-min.css (1376b)[100%] -> ie-min.css.gz (588b)[42%]
[INFO] No compression is enabled
[INFO] ie6.css (0b) -> ie6-min.css (0b)[100%] -> ie6-min.css.gz (20b)[2000%]
[INFO] No compression is enabled
[INFO] ie7.css (468b) -> ie7-min.css (468b)[100%] -> ie7-min.css.gz (221b)[47%]
[INFO] No compression is enabled
[INFO] ie9.css (177b) -> ie9-min.css (177b)[100%] -> ie9-min.css.gz (105b)[59%]
```