Create meal-order-admin-app component.

[PaulAgeyev]

In this PR:

• Created admin module

• Added polymer template

• Edited configurations of bower.json

• Added app-layout

• Integrated redux

• Created app-shell and meal-order-dialog-container components

• Created meal-order-admin-app component

• Created the following routing:
  /#/vendor/
  /#/menu/
  /#/order/
  /#/costs/

View on desktop and on mobile device:

[codecov]

Codecov Report

Merging #59 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #59 +/- ##
=======================================
Coverage 96.89% 96.89% =======================================
Files 15 15 Lines 547 547 Branches 30 30 =======================================
Hits 530 530 Misses 15 15 Partials 2 2