Update test_model to version that compares tempo/tempo2.
test Tdt
Revert Time->mpmath convert in spindown
Merge branch 'scott'
Added ability to set the JPL ephemeris when loading SPICE files
Use new TOA reading convenience function.  Other minor changes.
Added default for planet Shapiro in get_TOAs
Added info about how to compile ERFA from ERFA-fetch
Added param specifying which ephem was used for each TOA
Put script in code block
Change some parameters
test model using ipython notebook
Merge branch 'master' of https://github.com/scottransom/PINT into scott
Merge branch 'scott'
wrong time file
recover the tim file
add test gps to utc clock correction
switch off the tropospherical delay
Change general2 output for bat, sat to mpmath percision
correct tropo delay and gps2utc clk correction--