All projects using 0.7.0-rc2 fail to build when using maven-enforcer-plugin

**Issue**
Projects built with dropwizard-0.7.0-rc2 fail with two dependency convergence errors  

1. Dropwizard depends on jackson-annotations 2.3.1 but most jackson 2.3.1 dependencies for some reason still depend on jackson-annotations 2.3.0
2. Dropwizard depends on slf4j 1.7.6 but metrics-* depend on slf4j 1.7.5

**Reproduction**

1. Download **pom.xml** from https://gist.github.com/cmicali/9292420 and put it in any directory
2. Run **mvn install**

Expected: Build success
Actual: Enforcer error showing the above 2 dependency convergence errors

**Proposed Fix**

1. Switch jackson dependency back to 2.3.0 - unclear why 2.3.1 has dependencies to annotations 2.3.0, and there is nothing newer
2. Exclude slf4j dependencies on all the metrics dependencies - there is no newer metrics version available and 1.7.6 seems to have some good fixes http://www.slf4j.org/news.html