[optimize] Use gzip to compress data

[nemesifier]

We can reduce the use of memory of more than 70% thanks to gzip.

We should just do the following:

• a basic gzip is provided by busybox, this should be enough, I am not sure whether we should specify this in the dependencies or not, we should double check this
• gzip files after saving them, eg: gzip $path, this command also removes the original file
• decompress files before sending the data, eg: gzip -d $path

[devkapilbansal]

• a basic gzip is provided by busybox, this should be enough, I am not sure whether we should specify this in the dependencies or not, we should double check this

It would be better to specify this in dependencies.