ticket:10723: delete C++ RandomCollatorTest

git-svn-id: http://source.icu-project.org/repos/icu/icu@35238 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: readme about collation

git-svn-id: http://source.icu-project.org/repos/icu/icu@35239 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10678: cherry-pick Unicode 7.0 U+20BD RUBLE SIGN for ICU 53

git-svn-id: http://source.icu-project.org/repos/icu/icu@35241 251d0590-4201-4cf1-90de-194747b24ca1