Pretty printing of elliptic integrals
Replace duplicated code by dedicated function
Pretty printing of elliptic integrals
Replace duplicated code by dedicated function
Add tests for pretty printing of elliptic integrals
Don't use raw unicode character in _print_elliptic_pi()
Merge remote-tracking branch 'skirpichev/pr2164-test' into elliptic_print

Conflicts:
	sympy/printing/pretty/pretty.py
Change pretty printing of elliptic_pi function.
Merge pull request #2164 from raoulb/elliptic_print

Pretty printing of elliptic integrals