[mlaunch] Print host and ports of launched replica set nodes
[mlaunch] Check if the port where the mongos/d is launching is available
[mlaunch] Fix check_port_availability
limited the list of arguments that can be passed on to mongos.
This closes #31.
forgot to remove print statements.
Added Contributing page as tutorial.
changed some wording in contributing instructions. Added rule about commit messages.
mentioned Contributing page in CHANGES.
Datetime filtering has been separated into the util.hci module.
It now supports relative --from and --to arguments by themselves, as well as
month only and times with milliseconds.
added datetime filtering to CHANGES.md.
[mlogvis] Chart legend height determined automatically for large number of namespaces
[mlogvis] add title as "mlogvis - logfilename" to html file
fixed bug with --from when parsing from stdin.
added feature to CHANGES.md
Merge branch 'feature/mlogvis-feature1' of git://github.com/gianpaj/mtools into gianpaj-feature/mlogvis-feature1

Conflicts:
	mtools/mlogvis/mlogvis.py
fixed bug with self.args (was just args before).
Merge branch 'feature/mlaunch-feature1' of git://github.com/gianpaj/mtools into gianpaj-feature/mlaunch-feature1

Conflicts:
	mtools/mlaunch/mlaunch.py
mentioned contributor page on CHANGES.md. Added Gianfranco's changes to CHANGES.md.
changed CHANGES line slightly.
Merge branch 'datetimefilter-refactor' into develop

Conflicts:
	CHANGES.md
Update CHANGES.md

added more references to issues and fixed style problem for `--mongos NUM`