pjutils 0.0.0.9006

add coordinate transform funs
add fun to transform df to gps echarts lines json data.
add cal_gps_dist to calculate two points distance in earth.

pjtuils 0.0.0.9005

done travis build
done appveyor
fix doc link

pjutils 0.0.0.9004

fix vignettes build error
fix travis ci build error
add img border line
rebuild pkgdown

pjutils 0.0.0.9003

change mathjax to cndjs
custom head with favicon.ico
custom footer with ♥
custom pkgdown.css
add travis ci
add appveyor

pjutils 0.0.0.9002

add vignettes
goodpractice
tidy code style

pjutils 0.0.0.9001

fix binary_search_cpp tol bug, set double tol = 1e-8.

pjutils 0.0.0.9000

Added a NEWS.md file to track changes to the package.