Re-worked the version value to play nice with new installs
calculate median according to its definition
Merge pull request #43 from RIPE-NCC/fixmedian

calculate median according to its definition
'version' didn't belong in there
Merge branch 'master' into addNTPtypes

Conflicts:
	ripe/atlas/sagan/__init__.py
Merge branch 'master' into addNTPtypes

Conflicts:
	ripe/atlas/sagan/__init__.py
better variable naming
move median calculation to parent class and reuse it in calculating median for ntp offset and rtts