Game logic implemented already.

The only required thing is custom back button icon.
Adding content controller

Main gui and text field results handling. There nothing happens with those results and there is bug with not resizing fields when keyboard appears.
Help view controller.

It shows help, but there is no help. It'd be better to use resource strings for help content.
Statistics counts

User can count number of guessed cards and total number of cards, and this statistics is saved between application launches.
Login screen started, card view controllers reused

Login screen was slightly modified, but it still doesn't work properle.
Card view controllers are created only once, and then they are reused with changing its data source card. Their views are added just once, and then only thir visibility changes.
Merge branch 'djachenko'

* djachenko:
  Login screen started, card view controllers reused
  Statistics counts
  Help view controller.
  Adding content controller
  Game logic implemented already.

Conflicts:
	src/Erundopel/Erundopel.xcodeproj/project.pbxproj
	src/Erundopel/Erundopel/GameVC.m
	src/Erundopel/Erundopel/MainMenuVC.m
Merge branch 'ershov'

* ershov:
  Extract duplicate code in ParseManager to helper method
  Modify GameMode screen layout for iPad and iPhone, all orientations
  Fixed ParseManaged recreation
  Make Database singleton
  Add Pods to project, replaced FMDb with pod
  Adjust divider line size for different layouts
  Add font size adjust for iPad
  Improved main screen auto layout to adjust for orientation
  Fix compilation warnings.

Conflicts:
	src/Erundopel/Erundopel.xcodeproj/project.pbxproj
	src/Erundopel/Erundopel/GameVC.m
	src/Erundopel/Erundopel/MainMenuVC.m