Minor changes to the travis file
Reuse TRAVIS_OS_NAME for ios, move the ios checks after all the others,
add a new line between sections, drop unneeded search path for osx.
if(WIN32 AND NOT UNIX)
file(GLOB DLLs *.dll)
file(GLOB ICOs *.ico)
install(FILES
${DLLs}
${ICOs}
DESTINATION ${target_library_install_dir})
endif(WIN32 AND NOT UNIX)