gitignore: add *.c and *.so which are gen. by 'make'

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
Added matrix representation
Added to authors
Added matrix_zeros tests
Add vector representation to SHOBra and SHOKet, fixed tests, adjusted matrix_zeros in matrixutils.py
Fixed imports
Fixed doctests and import errors
Added dtype and changed default scipy matrix to lil_matrix
Fixed code quality
Merge pull request #1775 from thisch/gitignore-polys

gitignore: add *.c and *.so which are gen. by 'make'
Merge pull request #1729 from ottersmh/1dshorep

1dshorep
Add Stefen Yin, Thomas Hisch, and Matthew Hoff to the AUTHORS/aboutus/.mailmap

Welcome to SymPy!
Merge branch 'master' into rationals-printing-in-code