JDF-236 Fixed issues with link traversal in the contributing guide

Removed the use of the simple-expand plugin. The events attached on the enclosing div prevented links from being navigated to.
Replaced the simple-expand plugin with the Bootstrap collapse plugin.
Fix typo on JBoss Stacks get involved: s/bellow/below
Release 2.1.4.Final
JDF-385 - Change buzz/twitter to use twitter widgets
JDF-378 - Update to awestruct 0.5.1
Allowing URI illegal characters in usernames and passwords for GitHub
Fixing up the site so it works on awestruct 0.5.1
changes to update to awestruct 0.5.2
Add link to Migration Center
Update git submodule instructions
Use ignore file to skip guides - quickstarts and site updated