Create basic structure for todo app.
build up task model and most 'CRU' part of 'CRUD' functions
Commit because of adding .gitattributes
Change .gitignore to make it work correctly
add link to index and show page
make _form for partial
Some little bug fix, new complete column and bootstrap

1. correct the partial _form for task
2. add complete and timestamp columns to db
3. add bootstrap into the vender area
Use bootstrap to make things look a bit better

1. correct the bootstrap require part to get it works
2. modify views of tasks to get some effect from bootstrap