Merge pull request #17 from wrathematics/master

update
update

test_par.nc is no needed.
bib is rearranged.
cover is better now.
demo is changed.
vignette is not finished yet. should be done in 1-2 days.
update again.

typo....
add a plot
update
Merge pull request #7 from snoweye/master

several updates