Changes to more closely match stock EL tomcat package; update to 7.0.53

I needed a tomcat7 package for EL6 that closely matches the structure of the native tomcat6 package, so that it can be used with the tomcat Chef cookbook. So I made a few changes to your artifacts:

* Moved tomcat home to /usr/share/tomcat7
* Export JAVA_OPTS in the init script so that it will work with a EL-style sysconfig file with no exports
* Replaced jvm dependency with java
* Split off separate lib, admin-webapps, docs-webapp, examples-webapp, and root-webapp packages
* Move temp and work into /var/cache/tomcat7, with symlinks back
* Create /etc/tomcat7/Catalina/localhost directory
* Move webapps into /var/lib/tomcat7 with a symlink back
* Move the docs into /usr/share/doc
* Move libs into /usr/share/java/tomcat7 with a symlink back
* Move the digest and tool-wrapper scripts into /usr/bin
* Remove all .bat scripts from bin

I also updated to the latest, Tomcat 7.0.53.

I don't know what your needs are, but I thought I'd send you a request in case you'd like to merge.