LRDOCS-339, Added instruction to Liferay installation section to check that the Java -Dfile.encoding=UTF-8 parameter is set in Liferay's application server before proceeding
LRDOCS-401, Removed instruction to add the
ehcache.cluster.link.replication=true property (this property was wrong,
the correct one is ehcache.cluster.link.replication.enabled=true), clarified and
reorganized the cluster link and distributed caching sections
Merge branch 'master' into LRDOCS-339
removed sentence about JAVA_OPTS environment variable since it's just a convention to use JAVA_OPTS on some, not all, app servers
Merge pull request #414 from jrao/LRDOCS-339

http://issues.liferay.com/browse/LRDOCS-339
Merge pull request #415 from jrao/LRDOCS-401

http://issues.liferay.com/browse/LRDOCS-401