[NOJIRA] Portlet list UI cleanups.
[NOJIRA] More UI cleanups.
[NOJIRA] Fix default icon.
[NOJIRA] Fix some icon URLS to use c:url instead of hardcoding uPortal.
[NOJIRA] Switch to using the mobile icon for the portlet list.
NOJIRA: Styled icon badges, portlet details page

Conflicts:
	uportal-war/src/main/webapp/WEB-INF/jsp/Marketplace/portlet/entry.jsp
[NO_JIRA] marketplace UI updates.  Added back the isValidUrl code with a todo so that it's not forgotten about.
[NO_JIRA] marketplace UI updates.  Added back the isValidUrl code with a todo so that it's not forgotten about.
NOJIRA: Styled icon badges, portlet details page

Conflicts:
	uportal-war/src/main/webapp/WEB-INF/jsp/Marketplace/portlet/entry.jsp
[NO_JIRA] marketplace UI updates.  Added back the isValidUrl code with a todo so that it's not forgotten about.
[NO_JIRA] marketplace UI updates.  Fix bug where back button URL was not being set before it was being used.
Coding style update based on code review comments.
Merge pull request #423 from jhelmer-unicon/NOJIRA_marketplace_ui

UP-4248 Jazz up Marketplace UI.