Add M27-M39
Add tests N1 - N11
Changed tabs
Merge branch 'issue694'
Merge branch 'master' of git://github.com/sympy/sympy into issue694
Added dot product tests from different frames.
Minor Fix.
Added print statements and modified assertion tests
Added correct print statements
Assertion tests satisfying new trigsimp changes
Merge branch 'master' of git://github.com/sympy/sympy into issue694
Add several tests in part M
Use solve(), not reduce_inequalities().
Add systems
Merge branch 'master' of git://github.com/sympy/sympy into issue694
Rewrite XFAIL tests
Merge branch 'master' into issue694
rewrite test_M27
add title of section N
Correct test_M27
Split physics.mechanics examples into multiple files.