script for loading spice kernels.
spice tool box, not fully text yet
fixed DDDDD mistype
change spkzer(wrong function name) to spkezr(right one)
Merge branch 'jing'
Inserted some of Paul's TOA reading code.  Does not work yet.
Added tilde files
Added some basic information to the README including team and philosophy
Added a data directory
Added some ephemeris stuff
Added simple download script for ephemerides and Earth-rotation info
Added a couple more SPICE requirements
Added a couple of other required constants files
Improved the example for loading the kernels (including environment variable)