Add "Maraschino-custom" 

Add "Maraschino-custom" for those who wish to install a alternative branch of maraschino.
Asks for a git repository on install on dsm.
Make completes successfully  and package can be installed and run. I couldn't figure out the the "DNAME" variable so it could be slightly wrong but package works as expected.

Please use some other port such as 82x0 or 83x0. We tend to follow Synology's port numbering standard which uses a port ending with 0 for HTTP and 1 for HTTPS.
So you can also use 8262, 8264 and so on if you want for HTTP Maraschino. Check if that's not taken already by one of our package