Animated version of HiSPARC header logo

This can be used as Loading animation
Add README for animated logo
Repeat gif animation

Enable Looping and faster animation in gif
Use 4 space indentations
Add header-like still for the animation logo

The header and animated logo do not line up nicely,
the reason is still unknown.
Therefore, I created a header version of the animated logo.
This lines up perfectly with the animated logo.
Fix indentation
Added retina versions of the animated header

Update readme for animated
Tiny bug: retina version is not exactly 2x size of non-retina
Merge pull request #1 from HiSPARC/animated

Add animated version of the header logo.
Used in jSparc to incidcate AJAX activity