rename rules core
rename strat/branch core
remove strat.py, fix import in test_core
rename rules module to strategies
rules -> strategies in matrix expressions
rules -> strategies in unify
rules -> strategies in setup.py
Merge pull request #1804 from mrocklin/strat-refactor

Refactor strategies
preview: support for writing gen. tex file to disk

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
fix typo
Fix a test to test the right thing

See https://github.com/sympy/sympy/pull/1803#issuecomment-13903307.
Revert "Make test_travis.sh not executable"

This reverts commit 85886937514ae3d3f5105f45542d6d717ae03ee8.

Travis doesn't work if it isn't executable.
Merge branch 'master' of github.com:sympy/sympy
Merge pull request #1811 from mrocklin/random-parameters

Bugfix in sympy.stats - add support for random parameters
add Naturals0
add drv and PoissonDistribution
solve, sample, docstring in discrete
add Geometric Distribution
density -> distribution in frv.SingleFinitePSpace
refactor symbol, value, distribution to SinglePS