Added example to the lxc_conf argument in the start command

[ureyes84]

Clarifies documentation for the lxc_conf argument in the start command. The documentation says the parameter is a dict; however, it requires a specific syntax such as:

[{"Key":"lxc.cgroup.cpu.shares","Value":"1"}, {"Key": ..., "Value": }]`

Related to #79

[denibertovic]

@ureyes84 you should disable the autotrim feature of your editor for markdown files. The spaces at the end of the lines are actually required for new lines (I did this not so long ago XD)

This needs correcting but other than that it looks fine.

[ureyes84]

@denibertovic Sorry about that :) I've updated the pull request.

[denibertovic]

LGTM!

[shin-]

Thanks, I'll merge this. In the long run it would probably be a good idea to make the whole thing less tedious (by allowing input like {"lxc.cgroup.cpu.shares":"1"} (I'll create an issue)