Changed template folder structure so that mysite is not needed in INSTALLED_APPS

Refs #115.
Removed bare except clause in deploy chapter.
Fixed typo in URLs chapter.
Merge pull request #117 from bmispelon/template-settings

Changed template folder structure so that mysite is not needed in INSTALLED_APPS
Fixed typos
Minor clarification for filter objects
Merge pull request #120 from Railslide/QuerySet-typos

Fixed minor QuerySet typos
Removed tabs in django_orm chapter.

There shouldn't be any left now.
Removed trailing whitespace and empty lines in django_orm chapter.
Pep8-ified the examples in django_orm chapter.
Removed unnecessary .all() calls in django_orm chapter.