Modify the EIT files for the good of Travis

Modify the EIT files so they are proper FITS as Astropy want them to be, also they include a new history tag.

The problem we are having is due to some `\n` inserted by SunPy when reading the fits files which then they are written out.  Notice that as SunPy is at the moment and using the latest version of Astropy, you are not able to save files with multiple `COMMENT` (and probably `HISTORY`) lines.  This is due to some new checking done in Astropy implemented in https://github.com/astropy/astropy/commit/ff8bd13a55e85c784d7274a39a73b033f4cb25fd

The script used to update the images is available as a [gist](https://gist.github.com/dpshelio/b47d40724ac55984ec4c).