Merge pull request #932 from JeffPyeBrook/pr-missing-visitor-post-count-func

Visitor Post Count Function Was Missing
Update readme.md
Function to find all object type ids that have a specified meta key
Also fixed a bug
Also updated recent commit to adhere to coding stnadards (whitespace )
updated available since version number on new function
Fix query string in old function
Updated get meta by timestamp to return properly deserialized meta in standard wordpress array form
add filters
spell wordpress WordPress
Fix query when no comparison or timestamp is passed
added $wpdb->prepare to queries
Merge branch 'pr-meta-util-new-function' into dev-master
Shipping same as billing, and update of checkout page shipping fixes
Updates customer meta via as user enters data
Rmeoved excess whitespace, invalid hook calls
Fixed undefeined variable warning
fix shipping state visibility on page refresh
complete customer meta key audit
Visitor meta key consistancy updates
Fix string substitution error in item id
changed selector for meta items to be fully inclusive
fix bug in region name
added filter for ajax checkout information
changed order checkout data is applied in ajax response,  element replacement happens first so that values that are set have the elements that they apply to in the DOM