First bugfix release for Python 3 support

• fix import of QScintilla under PyQt5 PR #230
• add support for importing enaml files from zip archives #232
• fix menu item ordering under Python 3 #233
• fix repr of declarative function objects #235
• properly reset layout_container member in qt backend after a widget has been
  reparented #240
• fix calls to explicit_warn which could lead to global vars corruption #247
• add a text align member to Field to control text alignment #249
• fix the parsing rules for function definitions #252
• several improvements to the handling of comprehensions and lambdas #242 #245