Added Hide for ID

Added function to allow generic hide_on argument for metaboxes.
Merge branch 'master' into select-2-options

Conflicts:
	css/dist/cmb.min.css
	css/src/generic.css
Merge pull request #232 from humanmade/select-2-options

Select 2 options
Merge branch 'master' into better-args-parsing
merge new select2 args
Merge branch 'master' into emmunes
Test hide_on
Merge pull request #250 from humanmade/hide_for

Hide for
Fix regression - fields showing before initial draft/save
Bump version
Merge branch 'master' into gmap
Merge pull request #239 from humanmade/gmap

Gmap
Bugfix - show_on filter getting hooked in multiple times
Update readme
Merge branch 'better-args-parsing' into dev

Conflicts:
	classes.fields.php
Merge branch 'collapsable' into dev

Conflicts:
	class.cmb-meta-box.php
	css/dist/cmb.min.css
	css/src/group.css
Merge branch 'inverse-checkbox' into dev

Conflicts:
	classes.fields.php