Adds most of project's file structure

Progress on issues #1 and #2

Adds files that represent most of project's structure

Starts writing things from sfx module.

 On branch master
 Changes to be committed:
	modified:   .gitignore
	new file:   openurl/OpenURL.py
	new file:   openurl/_ContextObject.py
	new file:   openurl/__init__.py
	new file:   openurl/parse/_Parser.py
	new file:   openurl/parse/__init__.py
	new file:   openurl/sfx/__init__.py
	new file:   openurl/sfx/parser/_Parser.py
	new file:   openurl/sfx/parser/__init__.py