better detect ajax and other non-page requests to ensure that content-wrappers etc are not included for ajax and snippets;
problem introudced by https://github.com/civicrm/civicrm-wordpress/commit/b9011c2adad0bd245836d1705f580553df78540b
rename to avoid double-negative poor readability;
fix bad function call;
expand to include ical;
check for '/civicrm/' in request;
add usage of isPageRequest for registering wp init callback;
Merge pull request #42 from ginkgomzd/4.4-ajax-call-fix

better detect ajax and other non-page requests to ensure that content-wr...
Merge remote-tracking branch 'upstream/4.4' into 4.4-master-2014-06-01-20-53-38