Cleanup for move to Accumulo 1.4.4

• set .gitignore to standard eclipse
• update versions of Accumulo to 1.4.4
• Pin slf4j binding to 1.5.8

Accumulo, Thrift, and YCSB all use different versions of slf4j, causing
runtime issues because everything is bundled together. Pin the version
to something in the middle that seems to work, even if it's not the
latest and greatest version.