drop in pull request policy from old wiki

CONTRIBUTING.md

@@ -54,3 +54,68 @@ A new language feature requires a SIP (Scala Improvement Process) proposal. For
    - [Boy Scout Rule](http://programmer.97things.oreilly.com/wiki/index.php/The_Boy_Scout_Rule) should be applied.
 
 Please also have a look at our [Pull Request Policy](https://github.com/scala/scala/wiki/Pull-Request-Policy), as well as the [Scala Hacker Guide](http://www.scala-lang.org/contribute/hacker-guide.html) by @xeno-by.
+
+
+# Pull Request Policy
+
+taken from https://github.com/scala/scala/wiki/Pull-Request-Policy
+before it was put out of its misery
+
+Hi there, pull request submitter!
+
+Your pull request should:
+  - (... have been discussed on scala-internals)
+  - merge cleanly
+  - consist of commits with messages that clearly state which problem this commit resolves and how
+    - it should be stated in the active, present tense
+    - its subject should be 60 characters or less
+    - [conventions](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
+    - for a bug fix, the title must look like "SI-NNNN - don't crash when moon is in wrong phase"
+    - overall, think of the first line of the commit as a description of the action performed by the commit on the code base, so use the present tense -- that also makes them easy to reuse in release notes
+    - backports should be tagged as [backport], it's also nice to mention this when a commit purely refactors and is not intended to change behaviour
+    - when working on maintenance branches (e.g., 2.10.x), include [nomerge] if this commit should not be merged forward into the next release branch
+  - come with tests (included in the same commit as the functional change), or explain in detail why it cannot be tested (discuss this on scala-internals first). The tests itself should:
+    - be minimal, deterministic, stable (unaffected by irrelevant changes), easy to understand and review
+    - have minimal dependencies: a compiler bug should not depend on, e.g. the Scala library
+    - typically fail before your fix is applied (so we see that you are fixing a legitimate bug) and should obviously pass after your fix
+  - come with appropriate documentation
+    - for example, any API additions should include Scaladoc
+  - each commit must pass the test suite (checked automatically by the build bot by running approximately `ant test-opt`) 
+     - a commit is considered a unit of useful change and must thus pass the test suite
+       (this way we stand a chance running git bisect later)
+  - be assigned to one or more reviewers (if you're not sure, see the list below or contact scala-internals)
+     - to assign a reviewer, add a "review by @reviewer" to your PR description. NOTE: it's best not to @mention in commit messages, as github pings you every time a commit with your @name on it shuffles through the system (even in other repos, on merges,...)
+  - get the green light from the reviewer ("LGTM" -- looks good to me)
+     - review feedback may be addressed by pushing new commits to the request,
+       if these commits stand on their own
+
+Once all these conditions are met, and we agree with the change
+(we are available on scala-internals to discuss this beforehand),
+we will merge your changes.
+
+Please note: you are responsible for meeting these criteria  (reminding your reviewer, for example).
+
+### Pull request bot mechanics
+* The build bot automatically builds commits as they appear in a PR. Click on the little x next to a commit sha to go to the overview of the PR validation job. To diagnose a failure, consult the console output of the job that failed.
+  * 'PLS REBUILD ALL' will force the bot to rebuild (only necessary when a spurious failure occurred -- i.e., you expect a different validation outcome without changing the commit shas that make up the PR)
+
+### List of reviewers by area:
+
+* library: @phaller (Philipp Haller), @axel22 (Aleksander Prokopec -- concurrent & collection) 
+* specialisation: @axel22 (Aleksander Prokopec), @vladureche (Vlad Ureche), @dragos (Iulian Dragos)
+* named / default args, annotations, plugins: @lrytz (Lukas Rytz)
+* macros, reflection, manifests, string interpolation: @xeno-by (Eugene Burmako), @cvogt (Christopher Vogt)
+* type checker, inference: @odersky (Martin Odersky), @adriaanm (Adriaan Moors)
+* Language specification, value classes: @odersky (Martin Odersky)
+* new pattern matcher, implicit search: @adriaanm (Adriaan Moors)
+* partest, Continuations Plugin: @phaller (Philipp Haller)
+* error handling, lazy vals: @hubertp (Hubert Plociniczak)
+* backend: @magarciaEPFL (Miguel Garcia), @gkossakowski (Grzegorz Kossakowski), @dragos (Iulian Dragos)
+* repl, compiler performance: @retronym (Jason Zaugg)
+* swing: @ingoem (Ingo Maier)
+* scaladoc: @dickwall (Dick Wall)
+* optimizer: @vladureche (Vlad Ureche), @magarciaEPFL (Miguel Garcia)
+* build: @jsuereth (Josh Suereth)
+* random compiler bugs: @lrytz, @adriaanm, @hubertp
+* documentation: @heathermiller (Heather Miller), @dickwall (Dick Wall)
+* cps: @TiarkRompf (Tiark Rompf)