Travis-ci: use cpp environment and test clang

Following changes were made to the travis/shippable builds
* Travis - Use cpp environment instead of python
* Shippable - Added shippable.yml which uses python environment (though Miniconda is used to install python) since shippable does not support cpp
* Use Miniconda to install python (2.6, 2.7, 3.3, 3.4)
* Removed python 3.2 tests as miniconda does not support it.
* Travis - Added a test in clang
* Added `-Wno-constant-logical-operand` flag for Travis/Shippable builds
The #155 issue suggests few more.

Sent from my mobile phone.
On Dec 26, 2014 9:59 AM, "Isuru Fernando" <notifications@github.com> wrote:

> In csympy/lib/CMakeLists.txt
> <https://github.com/sympy/csympy/pull/354#discussion-diff-22280684>:
>
> > @@ -9,7 +9,7 @@ include_directories(BEFORE ${CMAKE_SOURCE_DIR}/src)
> >  cython_add_module_pyx(csympy_wrapper csympy.pxd)
> >  add_python_library(csympy_wrapper ${SRC})
> >  target_link_libraries(csympy_wrapper csympy teuchos ${LIBS})
> > -if (CMAKE_CXX_COMPILER_ID STREQUAL GNU)
> > +if (CMAKE_CXX_COMPILER_ID MATCHES GNU|Clang)
> >    # Must suppress strict aliasing for this file
> >    set_source_files_properties(
> >      csympy_wrapper.cpp
>
> Will do. Apart from 'Wconstant-logical-operand` what other flags have we
> turned off for the whole project that should have been turned off this
> file?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/sympy/csympy/pull/354/files#r22280684>.
>