Added process documentation
Refer to process docs in CONTRIBUTING.rst
Include analytics team in dev process
link to docs to rebase a pull request
Added a visualization of the PR process
core committers, not contributors
Add example for how scrum teams spend time reviewing contributor pull requests
remove duplicate "should"
index org changes
add index file
Merge pull request #3434 from edx/db/dev-process

Document our development/review process