(WIP) enable auto reload without livereload

[igrep]

Added a grunt task to (re)load the app automatically.

Unfortunately, livereload is not well-supported on platforms other than Mac:

• Windows version is still alpha (and I don't want to develop on it).
• For Linux, only guard-livereload is available, which is no more maintained.

So I looked for a way to make grunt automatically reload the app without livereload, then found one to use Chrome's --load-and-launch-app= option. According to the doc, Chrome just reloads the app when already launched. That is, it is possible to reload automatically by executing google-chrome --load-and-launch-app=app/ continuously by grunt watch. That's why I sent this pull request.

But there's a problem I have to discuss with you: I should extract some variables to be more flexible or DRY (as written as TODOs). But where should I put the variable? The top level of Gruntfile or other?

I'm sorry but I'm new to grunt. I'm glad if you give me some advice! Thanks!

[yoichiro]

test this please

[igrep]

Sorry, I found the added tasks doesn't work well, and I'm actually satisfied without the tasks. So I'll close. Thanks for reviewing.