Added link to changelog

Author: Andrew Hearin

docs/changelog.rst

@@ -0,0 +1,7 @@
+.. _changelog:
+
+**************
+Full Changelog
+**************
+
+.. include:: ../CHANGES.rst

docs/quickstart_and_tutorials/development/index.rst

@@ -4,9 +4,9 @@
 Developer documentation
 =======================
 
-The developer documentation contains guidlines for how to 
-stay up-to-date on Halotools development, submit bug reports and 
-contribute to the Halotools code base. 
+The developer documentation contains guidlines for how to
+stay up-to-date on Halotools development, submit bug reports and
+contribute to the Halotools code base.
 
 
 .. toctree::
@@ -15,3 +15,4 @@ contribute to the Halotools code base.
    staying_up_to_date
    bug_reports
    contributors
+   ../../changelog

docs/whats_new.rst

@@ -4,8 +4,7 @@
 What's New in Halotools v0.5
 ****************************
 
-All Halotools official releases include minor bug-fixes and performance enhancements. These are
-that can be reviewed in detail by filtering the `GitHub Issues page <https://github.com/astropy/halotools/issues/>`_ for issues that have been tagged with Milestone matching the release you are interested in.
+All Halotools official releases include minor bug-fixes and performance enhancements. All such changes appear in the :ref:`changelog`, and can also be reviewed reviewed in detail by filtering the `GitHub Issues page <https://github.com/astropy/halotools/issues/>`_ for issues that have been tagged with Milestone matching the release you are interested in.
 
 New Features
 ============