meteor update to 0.8.0

For rendering performance, I decided to update meteor to 0.8.0. iron-router also needs to be updated to 0.7.0 for new template engine called [Blaze](https://github.com/meteor/meteor/wiki/Using-Blaze).

to run with meteor 0.8.0

    $ cd app
    $ meteor --release 0.8.0

or just

    $ meteor update
    $ cd app
    $ meteor

if you have any issues with 0.8.0, please let me know. thanks.