Added workaround for HTML Imports.
Removed leftover reference to encoding shim.
Refactored message dialog element into HTML import.

Part of #327.
Minor comment update.
Refactored plugin-li element into HTML import.

Part of #327.
Fixed l10n and import scripts failing.

The l10n script was failing because the location of the pluginLI
template had changed. The import scripts were failing because their
importDoc JS var was getting overwritten by the other script.

Localised text has also been added back into message dialogs.
Fixed sidebar drag 'n' drop.

Was broken by refactoring in 18c0737d4e94e000d55d0a1b3fcdb21f00685da0.
Refactored editable table into HTML import.

The editable table element just extend's the table element's API, but
the rows to be used with editable tables have been moved into the import
too.
Moved editable table CSS into HTML import.
Refactored <plugin-menu>, <plugin-card> elements.

Part of #327.
Closed all HTML elements.

They were optional, but it's better to have them explicitly closed.
Merged <plugin-menu> into <plugin-card>.

It doesn't need to exist as a separate entity.
Fixed unresponsive cards, minor tidy.
Ignore bower_components.

I'm using it to manage Polymer dependencies as I try things out.
Updated import path to work with bower files.
Started trying to use Polymer.

Not very successfully, none of the icons show up, and I can't figure out
why not.
HTML import bug workaround, fixed icons.

There's something wrong with my custom URL handling, as starting up a
HTTP server and opening the page through that causes them to be loaded
fine. As such, I'm using a Chromium switch to disable the need for
custom handling, until I figure out what's wrong.
Added Polymer tooltips.

Might be worth it just for them. Also styling fixes for the game menu.
Styling is likely to change though.
Don't reload the current game if selected.
Implemented Polymer core-drawer-panel.

For the sidebar and main content parts of the page. It has a really
swish animation for when the screen is small, the drawer disappears.