Implement writing of firmware, infopage and nvm

Saving of data changed from a simple hex to Intel Hex to enable easy read and
write of the data with no need for external translation.
Options to program only a part of the flash are not yet implemented
Add info in the readme about the file formats being Intel Hex
Elaborate on the usage in the code
Add reset command
Install as suid root to avoid need to sudo all the time
Merge pull request #2 from baruch/master

Read infopage, nvm and firmware from file. Better CLI usage.