* [jvm-packages] Added libxgboost4j to CMake build
* [jvm-packages] Wired CMake build into create_jni.sh
* User newer CMake version on Travis
* Lowered CMake version constraints
* Fixed various quirks in the new CMake build
add_library(libxgboost SHARED ${SOURCES}) builds a library named
liblibxgboost.so; However, simply changing it to add_library(xgboost ...)
won't work, as add_executable(xgboost ...) and add_library(xgbboost ...)
will then have the same target name. This patch correctly handles the
same-name situation through SET_TARGET_PROPERTIES.
Fixed to work with future versions of visual studio i.e., 2015
MSVC has it's own section for setting compile parameters, it shouldn't need to fall into section below i.e., checking for c++11 as this is definitely already supported, though this isn't an issue for Visual Studio 2012, it breaks for later versions
of visual studio i.e., 2015 when the default c++ is version 14. Though still backward compatible with c++11
