Fix failed test SimpleTwoRegionNetworkIntrospection on 32 bit Linux

src/nupic/bindings/engine_internal.i

@@ -149,7 +149,9 @@ class IterablePair(object):
 
 
 //32bit fix -  Already seen by swig on linux32 where size_t is the same size as unsigned int
-#if !(defined(NTA_ARCH_32) && defined(NTA_OS_LINUX))
+#if (defined(NTA_ARCH_32) && defined(NTA_OS_LINUX))
+%template(Dimset) std::vector<unsigned long>;
+#else
 %template(Dimset) std::vector<size_t>;
 #endif
 

src/nupic/ntypes/Dimensions.cpp

@@ -25,13 +25,25 @@
 #include <nupic/utils/Log.hpp>
 #include <utility>
 
+#if (defined(NTA_ARCH_32) && defined(NTA_OS_LINUX))
+#include <climits>
+#endif
+
 using namespace nupic;
 
 Dimensions::Dimensions(){};
 
 Dimensions::Dimensions(std::vector<size_t> v)
     : std::vector<size_t>(std::move(v)){};
 
+#if (defined(NTA_ARCH_32) && defined(NTA_OS_LINUX))
+Dimensions::Dimensions(std::vector<unsigned long> v) {
+  for (size_t i = 0; i < v.size(); i++) {
+    push_back(v[i] & UINT_MAX);
+  }
+}
+#endif
+
 Dimensions::Dimensions(size_t x) { push_back(x); }
 
 Dimensions::Dimensions(size_t x, size_t y) {

src/nupic/ntypes/Dimensions.hpp

@@ -98,8 +98,20 @@ class Dimensions : public std::vector<size_t> {
    */
   Dimensions(std::vector<size_t> v);
 
-  /** Create a new 1-dimension Dimensions object.
+#if (defined(NTA_ARCH_32) && defined(NTA_OS_LINUX))
+  /**
+   * Create a new Dimensions object from a @c std::vector<unsigned long>.
+   *
+   * @param v
+   *        A @c std::vector of @c unsigned long, the value with the index
+   *        of @a n is the size of the @a n th dimension
+   *
+   */
+  Dimensions(std::vector<unsigned long> v);
+#endif
 
+  /** Create a new 1-dimension Dimensions object.
+   *
    * @param x
    *        The size of the 1st dimension
    *