ACCUMULO-1876 default for slf4j.version

Sets default to 1.4.3 as hadoop-1.0 is default in parent pom for 1.5.1-SNAPSHOT

Signed-off-by: Josh Elser <elserj@apache.org>
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1876 default for slf4j.version

Sets default to 1.7.5 as hadoop-2.2 is default in parent pom for 1.6.0-SNAPSHOT

Signed-off-by: Josh Elser <elserj@apache.org>
ACCUMULO-1876 Add default values for hadoop.version and httpclient.version to make ivy work.
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1876 Update the default versions from hadoop1 to hadoop2 values.
Merge branch '1.6.0-SNAPSHOT'