Docs updated
Intro and module structure completed.
Finished the tutorial
Fixed a typo
Fixed a typo
Fixed a doctest
Fixed Sphinx errors
Fixed the Docs
Few typos fixed
Matrix equation updated
Docs moved to Sphinx
Evaluate more terms for Laurent power series.  Fix issue 2555.
Add test for issue 2555
Merge branch 'master' into 2555-residue

Conflicts:
	sympy/series/tests/test_nseries.py
	sympy/series/tests/test_residues.py
Fix heuristic for Laurent series
Add test for github's issue 2519
Merge branch 'master' into 2555-residue
Merge branch 'master' into 2555-residue
Fix wester test X7 (wrong answer in the commit 79f8413)
Improved docs for previous work