Added method for clearing cache of resource

I think it is vary useful method, that is need for many developers.
I use it in my component and can do just
<pre>$res = $modx->getObject('modResource', 15);
$res->clearCache();
</pre>
Making Combo Selected Consistent

with the tree and rest of site
Making Grid Select Consistent

variabilizing green and red colors
adding a selected color variable
Fix overflow in dashboard widget panel
Prevent "core" namespace removal
Wrap each result (search bar) according to their type
i18n for search results (labels/sections) +
disabled "dummy" actions search until a viable solution is found
Playing with keyboard shortcuts (cmd/ctrl + alt + '/' should bring focus on search bar)
Basic clean up and organizing Sass

Does not affect styling but clears out a lot of extra cruft and
organizes styles into relevant files.

More logical groupings and consistency between properties.

Getting rid of manual prefixes to take advantage of Grunt-autoprefixer
where possible.
Clean up hard coded font references
Cleaning up hard coded fonts across all Sass files

Also added a few helpful links to the header of the index.scss file for
Contributors and cleaned up a few other miscellaneous bits.
Exposing more sneaky hard coded fonts to the lovliness of Sass
Merge branch 'pr/667' into develop

* pr/667:
  Exposing more sneaky hard coded fonts to the lovliness of Sass
  Cleaning up hard coded fonts across all Sass files
  Clean up hard coded font references
  Basic clean up and organizing Sass
Merge remote-tracking branch 'origin/pr/668' into develop

* origin/pr/668:
  Making Grid Select Consistent
  Making Combo Selected Consistent

Conflicts:
	_build/templates/default/sass/_colors-and-vars.scss
	_build/templates/default/sass/_tree.scss
	_build/templates/default/sass/_xtheme-modx.scss
	manager/templates/default/css/index.css
Merge remote-tracking branch 'origin/pr/669' into develop

* origin/pr/669:
  Fix overflow in dashboard widget panel
Merge remote-tracking branch 'origin/pr/670' into develop

* origin/pr/670:
  Prevent "core" namespace removal
Merge remote-tracking branch 'origin/pr/671' into develop

* origin/pr/671:
  Wrap each result (search bar) according to their type
Merge remote-tracking branch 'origin/pr/672' into develop

* origin/pr/672:
  i18n for search results (labels/sections) + disabled "dummy" actions search until a viable solution is found

Conflicts:
	manager/assets/modext/widgets/core/modx.searchbar.js
Merge remote-tracking branch 'origin/pr/673' into develop

* origin/pr/673:
  Playing with keyboard shortcuts (cmd/ctrl + alt + '/' should bring focus on search bar)
Normalizing Inputs