implements #2888  - simple/advanced searches
stylized and formated the advanced slidedown #2888
#2888 does the 'all
' search by defualt
Merge remote-tracking branch 'origin/master-2.3' into issue-2888-simple-content-search
#2888 try to minimize browser work when multiple requests have been fired
Merge pull request #2947 from dotCMS/issue-2888-simple-content-search

Issue 2888 simple content search