Add option for 24-hour clock countries

[Dragony]

Hi!

I'm from Europe and we use the 24 hours system. Sadly the lib doesn't display the time on the X axis correctly when in a zone with the 24 hour system.

Screenshot from the example page:

Greetings

[almossawi]

Hi there, Keep in mind that the labels along the x-axis show minutes and seconds, whereas the hour appears below the first tick.

Due to this line, the hour is formatted using a 12-hour clock and appended with either AM and PM. To change that, use an alternative directive, e.g. for a 24-hour clock:

d3.time.format('%H');

You'll find the corresponding line under js/common/x_axis.js

@hamilton Is this something we'd want to provide an option for?

[hamilton]

@almossawi I think it makes sense to provide an option. What should we call it?

[Dragony]

Hey there, sorry guys. It seems logical now that i've slept over it :) Thanks for the effort! An option sounds awesome too!

[matteocontrini]

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