Removing com.101tec zkclient for Apache Curator.

Squashed commit of the following:

commit 42bb2b44afbe781f9448b61b483ebef54c51ca56
Merge: 47422f0 3e97629
Author: Michael Spiegel <spiegel@addthis.com>
Date:   Thu Mar 27 17:52:46 2014 -0400

    Merge branch 'upstream' into curator

    Conflicts:
    	hydra-main/src/main/java/com/addthis/hydra/Main.java
    	hydra-main/src/main/java/com/addthis/hydra/job/Minion.java
    	hydra-main/src/main/java/com/addthis/hydra/job/SpawnManager.java
    	hydra-main/src/main/java/com/addthis/hydra/job/chores/ChoreWatcher.java
    	hydra-main/src/main/java/com/addthis/hydra/job/chores/PromoteAction.java
    	hydra-main/src/test/java/com/addthis/hydra/job/ChoreWatcherTest.java
    	pom.xml

commit 47422f0def77668ef699bd24fea445d9e1f1165b
Author: Michael Spiegel <spiegel@addthis.com>
Date:   Thu Mar 27 17:36:21 2014 -0400

    Adding exclusions for enforcer version conflicts.

commit 56ccae15f229e903a82b452faf24e0efcb27d3f4
Author: Michael Spiegel <spiegel@addthis.com>
Date:   Wed Mar 26 15:18:56 2014 -0400

    Adhere to code style + remove logs in unit tests.

    Replace static import * with multi line static imports.
    Replace an instance of a zookeeper client object with an AtomicReference
    that is populated on-demand to avoid spurious error messages in the unit tests.

commit 6963b32242325ae66d0ee69407ba22b9f2381e26
Author: Michael Spiegel <spiegel@addthis.com>
Date:   Wed Mar 26 14:19:57 2014 -0400

    Merge upstream changes into branch.

commit f68e5d174f0a4c421ec82c8dff572f92d37e475f
Author: Matt Abrams <abramsm@addthis.com>
Date:   Wed Feb 26 16:14:41 2014 -0500

    switch from iotech's ZkClient to Apache Curator