Rewrite atan2 as arg function
Improve rewrite of atan2 in terms of arg
Test rewrite to arg
Eval conjugates of atan2 expressions
Importing PR with Jordan form reduction for matrices
All tests now pass, code clean-up
LaTeX fix in documentation of jordan_cells
Address review comments
Few modification of ntheory
Remove unnecessary ()
Fix indent
Code clean-up, reformatting comments.
Comment formatting review
Merge pull request #2292 from Upabjojr/jordanMatrix

Adding Jordan form and exponentiation for all matrices
Add Markus Müller to the AUTHORS/aboutus. Welcome to SymPy!
Merge pull request #2296 from shikil/ntheory

Few modification of ntherory
Merge pull request #2285 from raoulb/atan2_improve

Atan2 improve