Core parser updates

Added $node to parser "is" parameter, add image parser to core, moved ipAddress to external file & add MAC address parser to renamed parser-network.js file
Pager: modify & add to widget the code from issue #711
Pager: plugin again updates output display on init
Core: add config & jQuery table object parameters to onRenderHeader function
Demos & themes: include caption in metro theme; add to various demos
Editable: make updatable. Fixes #732
Filter: wildcard filter match behaves logically. Fixes #727
Pager: Add url check to allow ajax updating of table. Fixes #730
Parsers: Update all date parsers to ensure valid dates
p must have ajaxObject, setting it up at init so we can use it to compare later on
Merge branch 'working' of github.com:Mottie/tablesorter into working
Pager: check for dynamically changing ajaxUrl option & cleanup
Filter: add filter_cellFilter option. Fixes #731
Core: fix ARIA caption label reference
Scroller: remove scroller_idPrefix in lieu of unique namespace id
Resizable: make to work inside overflow container. Fixes #737
columnSelector: prevent adding a media query when no priorities are set
UItheme: ignore nested tables
Parser: add named number parser & demo
columnSelector: col element now hidden with column. Fixes #740