ticket:10113: Added dtitvfmtsample.cpp. Updated the API document for DateIntervalFormat::createInstance (const UnicodeString &skeleton, const Locale &locale, UErrorCode &status) and 
DataIntervalFormat::createInstance (const UnicodeString &skeleton, const Locale &locale, const DateIntervalInfo &dtitvinf, UErrorCode &status)

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33780 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Add snippet tag to dtitvfmt.h, dtptngen.h and plurfmt.h to quote a fragment of the sample code in dtptngsample.cpp, dtitvfmtsample.cpp and plurfmtsample.cpp.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33784 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update dtptngsample.cpp to work properly on Linux.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33785 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update the sample code, dtitvfmt.h, dtptngen.h, and plurfmt.h.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33791 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update the sample code.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33794 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update ICU sample code.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33795 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update the ICU4 sample code.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33796 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10113: Update ICU4C sample code.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/bing@33797 251d0590-4201-4cf1-90de-194747b24ca1