Add an npm script as a shortcut for the Sequelize migrate command

[kwhinnery]

In case someone doesn't have the Sequelize CLI installed globally, it would be nice to be able to at least execute the migrations for the app without installing sequelize-cli globally. Create an npm script that accomplishes this task. Then, create a Grunt shell command which executes this script.

There might be something there already that does this as part of the startup process, but let's make a special purpose npm script.

[JamesMGreene]

@bganicky Looks like there is another part of this issue that your PR has not addressed yet:

Then, create a Grunt shell command which executes this script.

[JamesMGreene]

@bganicky Actually, your PR does not accomplish this part of the issue either:

In case someone doesn't have the Sequelize CLI installed globally, it would be nice to be able to at least execute the migrations for the app without installing sequelize-cli globally.

:confused:

[anthonybrown]

did this get fixed, I had to run an errand

[bganicky]

@JamesMGreene Forgot about the Grunt task, but the second concern should be ok because if you run "sequelize" from npm script, it should use the project's one in "node_modules/bin" instead the global one. But I messed upped the pull requests anyway. :)