Merge pull request #11 from pdpiech/master

Refactor MainActivity and implement Choose File dialog window
Merge pull request #15 from pdpiech/master

Implement NFC check dialog windows
Merge pull request #16 from pdpiech/master

Implement auto name field completion, add comments
Merge pull request #17 from pdpiech/master

Add TODOs to ReceiveActivity, add XML to manifest
Receive Functionality

Receive file feature completed