Turn preconditioner off by default in SS solver
Updated visualization

- Changed WignerNorm to MidpointNorm as the normalization is more
general.
-Enclosed function in try statement to catch loading if matplotlib not
available.
Fixed visualization

removed import of MidpointNorm from all
Removed MidpointNorm from visualization

Plan to make module dedicated to just matplotlib functionality.
Added complex math cdef functions
ADDED: complex c-functions to codegen

Definitions of most standard math functions are overloaded to call the
complex c-versions
Add complex_math.pxi to package_data
inlined functions
Removed global numpy import
_include_string already a string
Added int_max to sparse_utils
add cdef for pi

pi is no longer imported from numpy so must add it here
Update to Travis

- Switch from Py 3.3 to 3.4
- Add coveralls after sucess
fixed travis file
Added coveralls to pip install
Added coveralls badge
only return coverage results from py34 tests
fixed bug in syntax
fixed YAML indents to match 4 spaces
set python versions as numbers not strings