Rename os_agnostic.py to the more appropiate os_specifics

to encapsulate file system unique filename and path handling

apps/document_indexing/os_specifics.py

@@ -0,0 +1,20 @@
+import os
+
+from document_indexing.conf.settings import SUFFIX_SEPARATOR
+
+
+def assemble_suffixed_filename(filename, suffix=0):
+    '''
+    Split document filename, to attach suffix to the name part then
+    re attacht the extension
+    '''
+    
+    if suffix:
+        name, extension = filename.split(os.split(os.extsep))
+        return SUFFIX_SEPARATOR.join([name, unicode(suffix), os.extsep, extension])
+    else:
+        return file_filename
+
+
+def assemble_path_from_list(directory_list):
+    return os.sep.join(directory_list)