Use bower; add versioning and release process

[azirbel]

Resolves #78 and #98. This PR definitely needs review, since I'm no expert with bower or grunt. Feedback is much appreciated! @danjamin, @yayalice, or @bigsley might be able to help.

What this does:

• Move many dependencies to bower
• Remove dist folder
• Set up process to release to this repo and a shim repo for dist files
• Use grunt-text-replace and release-it to bump version numbers

No dist folder? How to develop and integration test?

• The dist folder is not in version control (hooray, fewer steps to PR!), but it's still generated by grunt.
• Use "bower link" and "bower link ember-table" when developing ember-table and testing with your app.

To be resolved:

• Need to figure out where the shim repo will be - could be in https://github.com/components, or a new Addepar repo.
• Need to transition bower to use the new shim repo without disrupting everyone's build

[petrvolny]

Great work!
My 2 cents:

• I think we can get rid of all the lockdown.json stuff now since we use bower for deps.
• I also noticed that we have grunt-browserify2 in Gruntfile.js which is not used anywhere in the repo so I suggest to remove it.

[yayalice]

Does bower install run as part of the default grunt task?

[azirbel]

Check whether this needs to be kept

[azirbel]

@yayalice so the reason this is gone is that antiscroll is now a dependency, and ember-table users will have to include it in their projects. For example, the demo app now has https://github.com/azirbel/ember-table/blob/bowerify/app/index.html#L13. It seems that in the past ember-table came with antiscroll.css included right in the ember-table.css file. Think this change makes sense?

[azirbel]

Thanks @petrvolny and @yayalice! I got rid of lockdown and grunt-browserify2 and added grunt-bower-task to install dependencies when grunt is run.

[azirbel]

Won't be migrating to the dist repo for now - I'm not convinced it's a good move yet. New PR (easier to review) is here: #157