Summary of commit:

Bug fixes:
* Fix #48 and close #48: The create_app function creates a py file on /views
* Fix #49 and close #49: The write_tree function writes the object name instead of the file name

Enhancements:
* Close #31: Convert app related functions to a class
* Close #32: Convert tree related functions to a class
* Close #47: The docstring of functions on filters.py should have an example