add support for algebraic functions in minpoly
fix test failures
add tests for minpoly over fraction fields
Fix bug in _choose_factor
minpoly: check that the variable is not contained in the ground domain
minpoly: fix test failures
minpoly: add support for algebraic extensions of QQ
minpoly: update documentation

also rename _minpoly_op_algebraic_number to _minpoly_op_algebraic_element
and update error messages
minpoly: add more tests
minpoly: fix doctest error
Add --split option to split the tests and doctests

The usage is

./bin/test --split 1/2

which will run the first half of the tests. Any a/b is supported.

Currently, this just splits the test files, because that was the easiest to
do, but we maybe should implement splitting the tests themselves.

Note that for the doctests, the regular doctests and the Sphinx doctests are
split independently. Furthermore, the Sphinx doctests split against every
Sphinx file, before it checks if it actually has doctests, so for some splits,
no Sphinx doctests will be run at all.
Implement test splitting in Travis

Now the regular tests are split into two test runs.
Print the split in the test header if there is one

This will help in debugging why this doesn't seem to work in Travis.
Sort paths in the tests

This should make --split act as you would expect it to, regardless of the
underlying filesystem.
Travis: Also split the gmpy tests
Sort the right thing when running the tests

This reverts commit 6495de3c4584754644a9b7f565ec2d7b893fbbf9, because it was
sorting the wrong list.
Update list of installed modules
Merge branch 'master' into AlgebraicDomain

Conflicts:
	sympy/polys/numberfields.py
	sympy/polys/tests/test_numberfields.py
minpoly: use dom.symbols instead of dom.gens

to determine whether a variable or expression is contained in the ground domain
minpoly: minor changes

-) use floor operator instead of converting to int
-) use c.is_negative istead of c < 0
-) remove unnecessary line