Fix height and width for Bootstrap carousel

[hbueno]

I think I've two paths to follow:

• edit images making (forcing) them to have equal dimension;

• define some style that auto-adjust the size for all images;

Important for issues #13, #50.

[hbueno]

Let's something like the example bellow:

<div class="carousel-inner" role="listbox" style=" width:100%; height: 500px !important;">
...
</div

Ref.: https://stackoverflow.com/a/33623912/11989056