Small fixes from PMD inspection

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@543 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Better strategy for detecting empty gzip file

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@544 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Decompressing .deflate files needs InflaterInputStream, not DeflaterInputStream

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@545 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Add messages to several Preconditions

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@546 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Let /ready respond to GET

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@547 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Choose explicitly between TLSv1 and TLSv1.1 SSL protocol. This avoids an incompatibility between Java 6/7 defaults.

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@548 0d189622-dca1-7e23-9e30-e8815eb7bd2f