Adds buyer, seller, noUser navBars.
Modifies registration dialog's header color.
createBuyItem button + modify order button with same actions as tabs
Adds notificaction link in seller's nav bar.
Displays seller, buyer, noUser navBars according to user's rol.
Fix missing </span> tag.
Fix: message alert(no point available - no points enabled ) disappeared
after creating order
Merge pull request #80 from mbmihura/loadNavigationBar

Load navigation bar
Merge pull request #79 from mbmihura/AddNextBackButtonsInBuyItem

Add next back buttons in buy item
Fixes CONFLICTS.