ifcparse refactoring (#190)

Unify attribute containers, provide latebound attribute access on IfcBaseEntity, more basic tests on Travis

src/ifcopenshell-python/ifcopenshell/__init__.py

@@ -60,7 +60,7 @@ def open(fn=None):
 
 
 def create_entity(type,*args,**kwargs):
-    e = entity_instance(ifcopenshell_wrapper.entity_instance(type))
+    e = entity_instance(type)
     attrs = list(enumerate(args)) + \
         [(e.wrapped_data.get_argument_index(name), arg) for name, arg in kwargs.items()]
     for idx, arg in attrs: e[idx] = arg

src/ifcopenshell-python/ifcopenshell/entity_instance.py

@@ -33,6 +33,8 @@ except ImportError as e:
 
 class entity_instance(object):
     def __init__(self, e):
+        if isinstance(e, str):
+            e = ifcopenshell_wrapper.new_IfcBaseClass(e)
         super(entity_instance, self).__setattr__('wrapped_data', e)
 
     def __getattr__(self, name):

src/ifcopenshell-python/ifcopenshell/file.py

@@ -27,7 +27,7 @@ class file(object):
     def __init__(self, f=None):
         self.wrapped_data = f or ifcopenshell_wrapper.file(True)
     def create_entity(self,type,*args,**kwargs):
-        e = entity_instance(ifcopenshell_wrapper.entity_instance(type))
+        e = entity_instance(type)
         attrs = list(enumerate(args)) + \
             [(e.wrapped_data.get_argument_index(name), arg) for name, arg in kwargs.items()]
         for idx, arg in attrs: e[idx] = arg