update readme.
rename readme to readme.md.
update readme.md.
change zkconnection and zkconnectiontimeout's getter to abstract.
update pom.xml.
fix bugs in zkcontext's initialization.
update pom.xml.
add empty handler for data deleted event.
Merge branch 'master' of https://github.com/anatman-xx/spring-zookeeper.git
update pom.xml.
merge from remote master branch.