add andres method for circle_perimeter
fix variable
fix docstring + PEP8
add references
Merge pull request #410 from sciunto/circle

Circle perimeter: add new method: Andres
Fix typo in doc string
new method: ellipse_perimeter
Use char type for circle_perimeter method for speedup
Use same cython directives for whole source file
Fix PEP8 issues
add myself to contributors
remove print statement
remove brackets
fix for master
fix docstring
add test point position circle-ellipse
Fix PEP8 issues
Add empty lines between functions
Wrap line and group imports
Make some stylistic code layout changes