[Solr Wiki] Update of "HowToContribute" by ErickErickson

[Apache Wiki <wi...@apache.org>]

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "HowToContribute" page has been changed by ErickErickson:
https://wiki.apache.org/solr/HowToContribute?action=diff&rev1=110&rev2=111

  'ant test' will run all of the unit tests. NOTE: this takes quite a while.
  }}}
  
+ NOTE: If your build hangs when building and especially on a "resolve" step, it's probably because there are left over lock files in your ivy directory (often because you crtl-c'd during a build). To fix this navigate to your .ivy2 directory and delete all of the "*.lck" files in the tree. For *nix operating systems, issue a command similar to: 
+ {{{find . -name "*.lck" | xargs rm}}}
+ 
+ 
  == Exporting to a local repository ==
  When making larger scale (please, try to keep your patches as small as humanly possible) changes, or when working in a team, you might want to be able to keep track of what you are doing locally. One way of doing so is to clone the lucene-solr repository and create a local branch to which you can commit all your work. Another way is using Github to create a fork of apache/lucene-solr and use that to commit code either individually or as a team. Once you are ready, you can send a pull request to lucene-solr after creating an issue on the lucene-solr Jira and mentioning the jira issue number in the pull request.