Linux tomcat apr的下载和安装
在linux环境里面运行tomcat都要安装apr，否则会报：
The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/local/java/jdk1.6.0_13/jre/lib/i386/client:/usr/local/java/jdk1.6.0_13/jre/lib/i386:/usr/local/java/jdk1.6.0_13/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib
