added cart item to the list of properties that need to be encoded
distinguish between user meta keys and visitor meta keys for internal meta
visitor class documentation and expiration time handling optimization
improved NULL handling in expiration time SQL
explit include of meta init in version 9 upgrade routine to allow upgrade to proceed
Fixes for database upgrade, NULL attribute on column in visitors, include file sequencing
new visitors associated with wordpress users should not expire
Some versions of mysql only allow single default timestamp columns, remove second default timestamp
Pass defaults on create visitor
Added wordpress to the list of bot user agents
removed last default using timestamp to avoid problems if server time is not the same as database time
Make sure visitor created time is properly initialized
removed unneeded error_log
Merge pull request #883 from JeffPyeBrook/pr-visitor-meta

VIsitor meta enhancements and bug fixes
No longer need to prefix customer meta because we aren't storing it in the wordpress tables
Merge pull request #884 from JeffPyeBrook/pr-visitor-meta

Enhancements and Fixes From Visitor Meta Testing
Prior to creating customer cookie check if bot user.  When bot user is detected emulate setting cookie.
Merge pull request #885 from JeffPyeBrook/pr-visitor-meta

Visitor meta bot and cookie enhancements
Fixed typo introducerd in prior commit that prevented new vusitor id from being created.
Add action hook firing on some private functions to facilitate benchmarking, testing and sequencing of other internal functions with visitor creation
Merge pull request #886 from JeffPyeBrook/pr-visitor-meta

Visitor meta fixes and performance tuning
Merge pull request #869 from JeffPyeBrook/theme-file-path-filter

Theme file path filter