Improvements to dump.py

* Uses the following instead of os.system
	- subprocess.call
	- subprocess.Popen
	- shutil.copy
	- os.remove

* Uses os.path.join instead of string concatenation
* Compresses the backups and provides an alternative
  compressed version of aligulac.sql
Added gzip dump to db.html.
Merge pull request #104 from Prillan/dump

Improvements to the dump.py script