Beta support: MMS on chatty/mmsd on Modem Manager - help/testing wanted!

[kop316]

Ok, so I cleaned up mmsd to support all of the features I think it needs for now. As of now, there are still two outstanding issues:

- if mmsd is configured with the wrong settings, you have to restart it for the correct settings to take affect.

• The issue is....strange. As far as I can tell, I am doing everything right for it to work, but my MMSC gives be a 503 error if I reconfigure the settings and attempt to use it. The error is immediately gone if I reset mmsd. If anyone has ideas, I would appreciate it. However, since the settings do not change very often and a reset makes it work, I am relatively unconcerned with this problem.
  

- While a domain name works as a proxy, an IP address does not. 

• I unfortunately do not have a carrier that uses a proxy, so I cannot work on this issue.
  

I also cleaned up the README and the documentation so that folks can build upon it!

But overall, I think mmsd is in really good shape! I would appreciate help in battle testing it now. I updated the readme for how to properly install it, and I need to look into how to get systemd to configure it now (since I am on Mobian. If you are on a different distro, feel free to submit how to get it working there)!