start support for linux32 systems

add apr-1 lib version for linux 32, same as linux64 -> link
add shared folders share/ and lib/python* to linux32

just copied from linux64
added libapr*

later add apr headers configured for 32bit too!
add libyaml.a

The linux32/lib/libyaml.a is statically compiled from the external/src/yaml-cpp.

    extract files and change directory in the extracted
    set static compilation in the CMakeLists.txt by changing set(LIB_TYPE SHARED) to set(LIB_TYPE STATIC)
    into build folder make and it should create the static library that we should copy and rename it to libyaml.a
add libz.a
SWIG error translating size_t to unsigned int creating redefinition to the latter type

Known problem and solution: See nupic/py/bindings/algorithms/algorithms_impl.i   around line 1000
// Already seen by swig on linux32 where size_t is the same size as unsigned int
%template(Size_T_Vector) std::vector<size_t>;

The error comes from a different point. Suggestion is to wrap in the nupic/lang/common/engine_internal_common.i  the

%template(Dimset) std::vector<size_t>;

in an #ifndef

//32bit fix
%template(Dimset) std::vector<size_t>;
reflect folder structure changes in master

remove python modules' sources, use pip
added arch/ folder to linux64

just a detail
add linux32 configured apr-1 headers

version 1.4.8 used
adding swig 32bit binary

version 1.3.36
add supported platforms to Linux readme

ARMv6 will come with the other branch