Add function to return mechanics expressions as strings.
Fix user_functions argument bug in CCodePrinter
Add test to ccode user_functions argument
Use % syntax for string formatting to fix test.
Fix incorrect % string formatting usage.
enable limits for certain sums of rational functions
Implement __long__

It is the same as __int__, because Python automatically coerces the output to
long().  That is also why we do not even test that the output is an instance
of long.

This fixes issue 3858.
Use SYMPY_INTS in Number.__new__ instead of (int, long)
Only define __long__ once on NumberSymbol
Remove extraneous whitespace
Merge pull request #2153 from asmeurer/__long__

Implement __long__
risch: factor out common expression.
risch: Fix WrongResult for x*exp(-k*x).

Fix issue 3886: Incorrect Piecewise result from risch_integrate
http://code.google.com/p/sympy/issues/detail?id=3886
Merge pull request #2170 from jrioux/integrals

Fix WrongResult for risch_integrate(x*exp(-k*x), x)
Add Ramana Venkata to the AUTHORS/aboutus. Welcome to SymPy!
upgrade solving for abs, powers, and real/imag variables

Also:

    use powdenest before factoring in _tsolve

    fix detection of difference of functions
add bivariate solving to solvers
edits after coverage check
modify preprocessing for lambert
remove use of match from _tsolve

XXX not sure why the ode test_linear_coefficients changed