started adding a function to support downloading of FITS files from VSO.
added acquire_fits to support downloading and analysing of FITS files from VSO.
directory fix for downloading FITS files from VSO
VSO files will no longer be re-downloaded if they already exist
bug fixes for FITS file downloading from VSO.
when using FITS, skip a code block intended for JP2 files.
more bug fixes to reading FITS files from VSO: return filelist with full absolute path now.
patch to visualize because name of map.norm function has changed in SunPy.
Merge pull request #42 from aringlis/acquire_fits

Added support for acquiring FITS files from VSO and analysing them