Merge pull request #2 from JosephRedfern/master

Fixed compile error for GCC<4.6, stopped freeing of undefined variable
Readded -O3 flag for speed optimization, should be compatible with most CCs now
Adds capability to perform a system call when a coin is mined
Putting the definition after the description for consistency
Fixed formatting
Fixed formatting, again
Added functionality to specify address in command line to pass to action syscalls, updated README.md to reflect this
Included checkcoin.py for basic coin validation
Python hashbang added
Merge pull request #1 from Elite6809/master

Merge latest changes