Merge pull request #1 from wrathematics/master

get all
Merge pull request #2 from wrathematics/master

pull
commit
update
pbdNCDF4
commit
Merge pull request #3 from wrathematics/master

update
Merge pull request #4 from wrathematics/master

pdf?
Merge pull request #5 from wrathematics/master

update
Merge pull request #6 from wrathematics/master

update
Merge pull request #7 from wrathematics/master

update
update a demo function
update again
Merge pull request #4 from snoweye/master

a few update