Extended support for Stellaris and Tiva C launchpad

[murilopontes]

• Implement software reset in bitbash boot command
• Implement EEPROM support eeinit(), eewrite(), eeread()

[matthijskooijman]

Here I am again, nitpicking ;-p

I would have kept these as two separate commits, but a single pullrequest. Having them as a single commit is probably also ok, I just consider two separate commits slightly cleaner.

I also had a closer look at the code and, as far as I can see, it looks good. I left two minor comments (if you change those, be sure to do a forced push to this branch to update this pullrequest instead creating a new one!).

Thanks!

[murilopontes]

code revised to energia.nu version 0101E0011