README: Fix instructions numbering (1. -> 4.)

The last installation step is labelled `4.` but GitHub's markdown parser thought it was the first item of another list, hence labelled it as `1.`
Merge pull request #25 from sonph/patch-1

README: Fix instructions numbering (1. -> 4.)
updated sidebar toggle javascript

Made improvements to the script.

* `.active` class which used to be added when toggled were conflicting
with bootstrap class, thus changed to `.on`.
* Changed so that target element(s) should be specified via
`data-target` attribute (like how bootstrap collapse script does). This
allows multiple toggle parts on one page.
* `togglejs()` method is added to jQuery, allowing it to be triggered
like this:
$(this).togglejs();
* `togglejs()` can be used to trigger one-way animation:
$(this).togglejs('show');
this does show the element, and if it is already shown does nothing.
fixed navbar brand overflowing on webkit

Navbar brand were overflowing into another line when rendered on webkit
under sm size (768px - 991px).
This cannot be reproduced when window size was shrinked from larger
width.
`display: table;` seems to be calculated to fit contents in one line
even if contents were floating.
modified memodump.css to fit vincef logo