Added rocket-commander readme
Changed LTC IP and made ltc.py +x
Merge branch 'master' of https://github.com/psas/launch-tower-comm
Made IOIndicator event driven
Removed central dict, added callback framework

This mostly just translates the functionality from central dict
to callbacks and doesn't hit a lot of the issues in the TODO.

Now that this is done we can start to fix that though.
Bug fixes
Merge branch 'master' of https://github.com/psas/launch-tower-comm