fixes factor(), separatevars(), combsimp() from Issue #6280
Update ask.py

TautologicalHandler is in _val_template + "common" + TautologicalHandler
Merge branch 'master' of git://github.com/sympy/sympy
free_symbols moved to QExpr
test cleanup
Merge pull request #7307 from kelvich/master

fixes factor(), separatevars(), combsimp() from Issue #6280
Merge pull request #7336 from sevaader/patch-1

Update ask.py
Add sevaader to the AUTHORS/aboutus. Welcome to SymPy!
Merge branch 'dsolve' of https://github.com/smichr/sympy into smichr/dsolve
Merge branch 'dsolve_fixes_pullable' of ssh://github.com/zanzibar7/sympy into dsolve_fixes_pullable
squash with last
watch out for negative args of log in evalf