Accepting new commiters

[Martin Matuska]

Hello,

I am writing a master thesis about open source development processes and one of 
my analysis objects are processes of the FreeBSD project. The FreeBSD 
documentation (handbook, articles) is a great source of information, but there 
are some points missing in the documentation I consider important.

I would like know more on the following items:

1. Who makes the decision, who is authorized and who is responsible for 
accepting (adding) new commiters?

2. Who makes the decision, who is authorized and who is responsible for 
releasing (deleting) existing commiters (whatever reason)?

A great help would be a link to a document describing this issue (but a simple 
answer helps, too).

Thank you very much.