Update contributing document

Author: p

CONTRIBUTING.md

@@ -1,64 +1,51 @@
-## Contributing to the MongoDB Ruby Driver
+# Contributing to the MongoDB Ruby Driver
 
 Thank you for your interest in contributing to the MongoDB Ruby driver.
 
-We are building this software together and strongly encourage contributions
-from the community that are within the guidelines set forth below.
+We are building this software together and appreciate and encourage
+contributions from the community.
 
-Bug Fixes and New Features
---------------------------
+JIRA Tickets
+------------
 
-Before starting to write code, look for existing [tickets]
-(https://jira.mongodb.org/browse/RUBY) or [create one]
-(https://jira.mongodb.org/secure/CreateIssue!default.jspa) 
-for your bug, issue, or feature request. This helps the community
-avoid working on something that might not be of interest or which
-has already been addressed.
+The Ruby driver team uses MongoDB JIRA to schedule and track work.
+To report a problem with the driver, please [create a new issue]
+(https://jira.mongodb.org/secure/CreateIssue!default.jspa) in the Ruby
+JIRA project. A ticket is appreciated, though not necessary, when submitting
+a pull request.
+
+Please consult [JIRA issues](https://jira.mongodb.org/browse/RUBY)
+for existing known issues in the driver.
 
 Environment
 -----------
 
-We highly suggest using [RVM](https://rvm.io/) or [rbenv]
-(https://github.com/sstephenson/rbenv) to set up Ruby development and
-testing environments. In this way, moving between and testing code for
-alternate Ruby versions (besides the one possibly included with your 
-system) is simple. This practice is essential for ensuring the quality
-of the driver.
-
-Pull Requests
--------------
-
-Pull requests should be made against the master (development)
-branch and include relevant tests, if applicable. The driver follows
-the Git-Flow branching model where the traditional master branch is
-known as release and the master (default) branch is considered under
-development.
+We recommend using [rbenv](https://github.com/sstephenson/rbenv) to set up
+the Ruby development and testing environments, though other tools like
+[RVM](https://rvm.io/) will also work. The driver currently supports
+MRI 1.9.3-2.6 and JRuby 9.1-9.2.
 
-Tests should pass under all Ruby interpreters which the MongoDB Ruby 
-driver currently supports (1.8.7, 1.9.3, JRuby 1.6.x and 1.7.x) and will be 
-automatically tested.
+A MongoDB cluster is required to run the tests. Setup procedures and
+recommendations for various clusters, as well as how to configure the
+driver's test suite, are covered in the [spec
+readme](https://github.com/mongodb/mongo-ruby-driver/blob/master/spec/README.md).
 
-The results of pull request testing will be appended to the request.
-If any tests do not pass, or relavant tests are not included the pull
-request will not be considered.
+The driver is tested on [Evergreen](https://github.com/evergreen-ci/evergreen),
+MongoDB's in house continuous integration platform. After a pull request
+is created, one of the Ruby driver team engineers will schedule continous
+integration builds on Evergreen.
 
-Clusters and Replica Sets
--------------------------
-
-If your bug fix or enhancement deals with Cluster or Replica Set
-code, please run all relevant tests for those code subsets before
-issuing the request.
-
-* `rake test:sharded_cluster` for sharded clusters
-* `rake test:replica_set` for replica sets
+Pull Requests
+-------------
 
-Cluster and Replica Set testing is currently **not** automatically
-performed so it is important they are run in a thorough fashion under
-all supported interpreters before a pull request is made.
+Pull requests should be made against the master (development) branch and
+include relevant tests, if applicable. The Ruby driver team will backport
+the changes to the stable branches, if needed.
 
 Talk To Us
 ----------
 
-We love to hear from you. If you want to work on something or have
-questions / complaints please reach out to us by creating a [question]
-(https://jira.mongodb.org/secure/CreateIssue.jspa?pid=10005&issuetype=6).
+We would love to hear from you. If you want to work on something or have
+questions please reach out to us by creating a [question]
+(https://jira.mongodb.org/secure/CreateIssue.jspa?pid=10005&issuetype=6)
+in JIRA.