Adjust comments, add preliminary check for NFC

- Fix issue where app would crash upon opening when the device has no
NfcAdapter hardware
- Adjust positioning of javadoc comments and add a few single-line
comments
Begin NFC check dialog window implementation
Implement NFC check dialog windows
Merge pull request #15 from pdpiech/master

Implement NFC check dialog windows
Implement auto name field completion, add comments

- Add the ability to automatically load and save the first and last
names the user last used when sending a file
Merge pull request #16 from pdpiech/master

Implement auto name field completion, add comments
Add TODOs to ReceiveActivity, add XML to manifest
Merge pull request #17 from pdpiech/master

Add TODOs to ReceiveActivity, add XML to manifest
Receive Functionality

Receive file feature completed