community bonding

Hi PostgreSQL community and mentors:

Thanks for selecting my project as one of GSoC student projects! Pretty
exciting and honor to join the development for PostgreSQL (the best
database in the world :)). So for the first phase of this project
(community bonding), I am planning to go ahead to set up my developing
environment and familiar with the related code bases. And I have several
questions regarding this.
1. What ide or command line tools do you guys used most for PostgreSQL
development?
2. What version control do you use for postgres? Is github acceptable?
3. How do you look at code in PostgreSQL code base? do you have cross
function reference where I can search function and definition online?

Also let me know if you have requirements in this phase which are not
covered by my plan.

Thanks Charles.