[Cassandra Wiki] Update of "HowToContribute" by MichaelGreene

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The following page has been changed by MichaelGreene:
http://wiki.apache.org/cassandra/HowToContribute

The comment on the change is:
Make headings, add link to empty CodeStyle and IDEA page

------------------------------------------------------------------------------
   1. Check out the latest version of the source code
    * svn checkout http://svn.apache.org/repos/asf/incubator/cassandra/trunk cassandra-trunk 
   1. Modify the source to include the improvement/bugfix
-   * Verify that you follow Cassandra's formatting conventions.
+   * Verify that you follow Cassandra's CodeStyle.
    * Verify that your change works by adding a unit test.
    * Make sure all tests pass by running "ant test" in the project directory.
   1. When you're happy with the result create a patch:
@@ -15, +15 @@

   1. Wait for other developers or committers to review it and hopefully +1 the ticket
   1. Wait for a committer to commit it.
  
+ == Testing and Coverage ==
+ 
  Setting up and running system tests:
  
   1. install python setuptools, if necessary (`apt-get install python-setuptools`)
@@ -22, +24 @@

   1. from trunk/interface/, run `thrift -gen py cassandra.thrift`
   1. `nosetests` from trunk/
  
- Addendum: running the code coverage task:
+ Running the code coverage task:
  
   1. Unzip this one: http://prdownloads.sourceforge.net/cobertura/cobertura-1.9.1-bin.zip?download
   2. ant codecoverage -Dcobertura.dir=/path/to/cobertura
@@ -30, +32 @@

  
  This is also available on Hudson (which updates about once every 24h) here: http://hudson.zones.apache.org/hudson/job/Cassandra/110/cobertura/
  
- IntelliJ Project Settings:
  
+ == IDE ==
-  1. Main Class: org.apache.cassandra.service.CassandraDaemon
-  2. VM Parameters: -ea -Xmx1G -Dstorage-config=conf -Dcassandra-foreground
  
+  * Self:RunningCassandraInIDEA
+  * IntelliJ Project Settings:
+    * Main Class: org.apache.cassandra.service.CassandraDaemon
+    * VM Parameters: -ea -Xmx1G -Dstorage-config=conf -Dcassandra-foreground
+