Adds "Release Notes/Known Bugs" to Changelog,updates file format to markdown, standardizes the format of previous entries

Per a request to have initial release notes that specifically listed known issues for this PE 3.2 release, and barred by time constraints from automating a pull from open issues in JIRA, this commit adds a Release Note and Known Bug section to the Changelog for the imminent 3.2 release.As it will display on the Forge, updates file type to markdown and standardizes previous entries. Adds template for release notes to be filled in later.

CHANGELOG.md

@@ -1,32 +1,45 @@
-2014-02-12 1.0.1
+##2014-03-04 - Supported Release 1.0.x
+###Summary
 
-Summary:
+####Features
+
+####Bugfixes
+
+####Known Bugs
+
+* Not supported on Windows.
+
+
+##2014-02-12 - 1.0.1
+
+###Summary
 
 Minor bugfixes for sorting of fragments and ordering of resources.
 
-Bugfixes:
+####Bugfixes
 - LANG => C replaced with LC_ALL => C to reduce spurious recreation of
 fragments.
 - Corrected pluginsync documentation.
 - Ensure concat::setup always runs before fragments.
 
-2013-08-09 1.0.0
 
-Summary:
+##2013-08-09 - 1.0.0
+
+###Summary
 
 Many new features and bugfixes in this release, and if you're a heavy concat
 user you should test carefully before upgrading.  The features should all be
 backwards compatible but only light testing has been done from our side before
 this release.
 
-Features:
+####Features
 - New parameters in concat:
  - `replace`: specify if concat should replace existing files.
  - `ensure_newline`: controls if fragments should contain a newline at the end.
 - Improved README documentation.
 - Add rspec:system tests (rake spec:system to test concat)
 
-Bugfixes
+####Bugfixes
 - Gracefully handle \n in a fragment resource name.
 - Adding more helpful message for 'pluginsync = true'
 - Allow passing `source` and `content` directly to file resource, rather than
@@ -36,7 +49,7 @@ defining resource defaults.
 - Allow WARNMSG to contain/start with '#'.
 - Replace while-read pattern with for-do in order to support Solaris.
 
-CHANGELOG:
+####CHANGELOG:
 - 2010/02/19 - initial release
 - 2010/03/12 - add support for 0.24.8 and newer
              - make the location of sort configurable