getCapabilities(person) returns a map of capabilities for a given
      person.
  
    Parameters
- person
- A TemplateNode object representing the user to check.
Returns
Returns a map of capabilities as boolean assertions for the specified person.
Example
...
<#assign caps = people.getCapabilities(myPerson)>
<#assign keys = caps?keys>
<#list keys as k>
  <p>${k}: <#if caps[k]>TRUE<#else>FALSE</#if></p>
</#list>
      The preceding code snippet would result in output such as the following:
isGuest: FALSE
isMutable: TRUE
isAdmin: TRUE        
      
    