Add new contributors

Left out of 0.0.39: Add new contributors, formatting changes to changelog

Testing Done:
CI in progress https://travis-ci.org/pantsbuild/pants/builds/72527889

Bugs closed: 1867

Reviewed at https://rbcommons.com/s/twitter/r/2527/

.mailmap

@@ -22,6 +22,7 @@ Dan Davydov <[email protected]>
 Fedor Korotkov <[email protected]>
 Jon Boulle <[email protected]>
 John Sirois <[email protected]>
+Kris Wilson <[email protected]>
 Larry Hosken <[email protected]>
 Leo Kim <[email protected]>
 Marius Eriksen <[email protected]>

CONTRIBUTORS.md

@@ -59,12 +59,14 @@ Created by running `./build-support/bin/contributors.sh`.
 + Larry Hosken
 + Lei Wang
 + Leo Kim
++ Luc Cary
 + Marc Abramowitz
 + Marius Eriksen
 + Mark Chu-Carroll
 + Mark McBride
 + Mateo Rodriguez
 + Mathew Jennings
++ Matt Olsen
 + Matthew Jeffryes
 + Maxim Khutornenko
 + Michael Doherty

src/python/pants/CHANGELOG.rst

@@ -4,16 +4,15 @@ RELEASE HISTORY
 0.0.39 (7/23/2015)
 ------------------
 
-Release Notes
-~~~~~~~~~~~~~
-
 API Changes
 ~~~~~~~~~~~
+
 * Disallow jar_library targets without jars
   `RB #2519 <https://rbcommons.com/s/twitter/r/2519>`_
 
 Bugfixes
 ~~~~~~~~
+
 * Fixup PythonChroot to ignore synthetic targets.
   `RB #2523 <https://rbcommons.com/s/twitter/r/2523>`_
 
@@ -31,14 +30,15 @@ Bugfixes
 
 New Features
 ~~~~~~~~~~~~
+
 * Invalidate tasks based on BinaryUtil.version.
   `RB #2516 <https://rbcommons.com/s/twitter/r/2516>`_
 
 * Remove local cache files
   `Issue #1762 <https://github.com/pantsbuild/pants/issues/1762>`_
   `RB #2506 <https://rbcommons.com/s/twitter/r/2506>`_
 
-* Option to expose intransitive target dependencies
+* Option to expose intransitive target dependencies for the dependencies goal
   `RB #2503 <https://rbcommons.com/s/twitter/r/2503>`_
 
 * Introduce Subsystem dependencies.
@@ -47,13 +47,13 @@ New Features
 
 Small improvements, Refactoring and Tooling
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 * Increase robustness of ProcessManager.terminate() in the face of zombies.
   `RB #2513 <https://rbcommons.com/s/twitter/r/2513>`_
 
 * A global isort fix.
   `RB #2510 <https://rbcommons.com/s/twitter/r/2510>`_
 
-
 0.0.38 (7/21/2015)
 ------------------