Improve key mapping speed by trying successful keys first
Enable option to write the manufacturer block
Merge branch 'master' of https://github.com/alfs/MifareClassicTool into write_block0

Thanks to: alfs (Stefan).
Conflicts:
	Mifare Classic Tool/src/de/syss/MifareClassicTool/Activities/WriteTagActivity.java
Optimized the key mapping code.
Added a warnig notice for writing to the first block & updated layout.
Updated readme and Help & Info section.
Reverted my fu**up from some commit before.