quick tests and checks for WP/PHP version numbers
add new object variables for WP/PHP versions
add new headers for requires WP/PHP

these headers may be subject to change and will need to be propagated to Bitbucket and themes.
add requires headers for themes and bitbucket
add wp/php versions check for theme updates
use strtolower to help make 'PHP standardized'
fix for 'PHP standardized' version number
use boolean selector for version_compare
makes order similar to plugin updater
refactor update checks into function

checks theme/plugin object, WP version and PHP version
cleanup
more cleanup
set minimum PHP version
simplify return of can_update
set WP version default and return

concatenated boolean
Merge branch 'check-versions' into develop
changes and readme updates