Update README.md

Add repository for Deb install
Debian packaging for v1.3.0
Minor issues on Deb packaging
Changing shebang for Debian packaging (python-script-but-no-python-dep)
Changing control file for Debian packaging
Updating README.md for v1.3.0
Update README.md
More work on fixing filtering error for parentheses.
Merge branch 'master' of https://github.com/mNantern/QTodoTxt