Add random shuffling to "Add.primitive" method.

[goodok]

It is technical commit for the tests aims.
The first commit not influence

The more interesting to add random.shuffle to 'Add.flatten' method. (the second commit).
This give Failures which can be classified as:

in tests:

1. my new tests which tests the order presereved.
2. Hided (I think) bug in the Order class, with logarithms.
3. obviously, tests which are based with testings the .args order at
   the result expression.
4. written in the form with order dependency. E.g. Mathematically
   solve function must return the sets, not ordered list.

Note also, I replaced output to sets in some cases previously, for tests
related with solve-like functions,

Also: "sift" and "as_coeff_add" but may be they are belong to 3.

1. Unknown:

split_surds - I don't know about it.
cse - may be related with 4. that is lists in output incorrect, must be set.

[goodok]

SymPy Bot Summary: All tests have passed.

Test results html report: http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sYtrIRDA

Interpreter: /usr/bin/python (2.7.2-final-0)
Architecture: Linux (64-bit)
Cache: yes
Test command: setup.py test
master hash: de84ed2
branch hash: 52f1ef6

Automatic review by SymPy Bot.

[goodok]

SymPy Bot Summary: All tests have passed.

Test results html report: http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sYquQQDA

Interpreter: /usr/bin/python (2.6.6-final-0)
Architecture: Linux (32-bit)
Cache: yes
Test command: setup.py test
master hash: de84ed2
branch hash: 52f1ef6

Automatic review by SymPy Bot.

[goodok]

SymPy Bot Summary: All tests have passed.

Test results html report: http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sY-fMQDA

Interpreter: /usr/bin/python (2.6.6-final-0)
Architecture: Linux (32-bit)
Cache: yes
Test command: setup.py test
master hash: de84ed2
branch hash: 52f1ef6

Automatic review by SymPy Bot.

[goodok]

SymPy Bot Summary: There were test failures.

@goodok: Please fix the test failures.

Test results html report: http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sY-vMQDA

Interpreter: /usr/bin/python (2.7.2-final-0)
Architecture: Linux (64-bit)
Cache: yes
Test command: setup.py test
master hash: de84ed2
branch hash: c90872f

Automatic review by SymPy Bot.

[goodok]

SymPy Bot Summary: There were test failures.

@goodok: Please fix the test failures.

Test results html report: http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sYsosRDA

Interpreter: /usr/bin/python (2.7.2-final-0)
Architecture: Linux (64-bit)
Cache: yes
Test command: setup.py test
master hash: de84ed2
branch hash: c90872f

Automatic review by SymPy Bot.