Download jasmine test framework.

- Download jasmine framework
https://github.com/pivotal/jasmine/blob/66bd8c78257e11bc0b1d9411c3ab53c81bec4f46/dist/jasmine-standalone-1.3.0.zip
- Move file_system.js to src/file_system.js
create file_io object

- create file io object
- pass 1st test.
fix bugs
add truncate function.

- add truncate function.
- add truncate test.
- pass all test.
refactering
refactering
refactering

- add size argument to init() function.
- define waitsStable() function.
rename stable -> ready
add canOperate function

If fileOperation() called from user during operating.
display error log and return.
fix index.html

- add file_system_controler.js
- add setCallBack func to file_system.js