Correctly format markdown headings

CONTRIBUTING.md

 # Contributing
 This project follows the normal github workflow.
 
-#Working on a feature or issue
+## Working on a feature or issue
 * Please make a fork of the repository if you do not already have one.
 * Create a branch for the feature/issue with a name like `feature-x` or `issue-#`.
 * Commit your changes to that branch.

README.md

 # Planet Red
 Planet Red is UNL's implementation of elgg
 
-#Directory Structure
+## Directory Structure
 * elgg - the elgg directory.  Currently a submodule, checked out at 1.8.19
 * vagrant - various vagrant boxes for development/testing.  Use vagrant/dev/ for development
 * plugins - Our custom plugins such as auth and themes that need to be symlinked.  Keeping the plugins out of the elgg directory makes for easy upgrades.