Change all the queries to Textbook model to Tasks.
Since Textbook model is deprecated now, implemented the changes
in the views to query respected queries and make corresponding
changes in the views.
# use glob syntax.
syntax: glob
*.pyc
*.zip
*~
.project
.pydevproject
app.yaml
build
tests/coverageResults
*,cover
tests/.coverage
*.git
*.egg-info
eggs
parts
.installed.cfg
bin
develop-eggs
.gitignore
.DS_Store
.settings
.*.swp
*.egg
*.egg-link
*.svn*
*.wpr
.installed.cfg
src/*
parts
downloads
.xvpics*
.project
pytask/local.py
pytask/pytask.egg-info
pytask/static/media
apache/*
*.swp
*.bak
*.swo
*.db-journal
*.db
migrations