igcd, ilcm: accept list of integr
Merge master
return 1 if gcd is 1
MatrixBase.is_zero supporting None results.

Extended original implementation of MatrixBase.is_zero to return None if the
matrix may or may not be a zero matrix.  Also found a workaround to issue 4114
to have this method accessible to ImmutableMatrix.

See http://code.google.com/p/sympy/issues/detail?id=4114
plot functions now pass on kwargs when constructing series.
Merge pull request #2637 from Tempel/matrix_is_zero

MatrixBase.is_zero supporting None results.
Don't set the doctest encoding

This breaks when sys.__stdout__ is None, which can happen on Windows. It is
not needed anyway because the stdlib doctest already does the same thing.

Fixes #2681. Thanks to Vivek Mohta for the report.
Merge pull request #2388 from shikil/gcd

igcd(*[5, 10, 15])
Bump version to 0.7.4.1
Fix the release script to work with versions like 0.7.4.1
Add newline when updating releases.txt
Make test_pypi work with ints
Merge branch 'master' into 0.7.4.1

Conflicts:
	sympy/__init__.py
Merge pull request #2684 from sympy/0.7.4.1

0.7.4.1
Added `to_matrix` method to Vector and Dyadic in mechanics.

When jumping back and forth from symbolics to numerics when using the mechanics
module it would be nice to be able to output the matrix forms of vectors and
dyadics with respect to different reference frames. I've added two new methods
that provide this functionality. It is particularly useful for returning
inertia tensors in reference frames from dyadics as the tensor form in the more
widely used.
Changed syntax on the doc test so it now passes.
Added links to missing docs in RST file for the diffgeom module
Better docs for Subs.

- Added examples to resolve confusion regarding the result of subs and the limiting value of the expression at that point
- Added examples to clearly show the difference between substitution and numerical evaluation.
- Added `evalf` in the `See Also` of `Subs` documentation section.
minor doc fix
Merge pull request #2688 from Upabjojr/diffgeom_doc

Added links to missing docs in RST file for the diffgeom module