Bumped version number

Merge pull request #15 from Sage/feature_optional_redis_cache

OptionalRedisCacheStore

Merge pull request #14 from Sage/bump-version-to-0-1-5

Bump patch level version

Merge pull request #10 from Sage/bugfix_redis_empty_string_issue

Bugfix - Empty string issue

Merge pull request #9 from Sage/release-0.5.2

Release v0.5.2

Merge pull request #5 from Sage/feature_redis_connection_pool_update

Redis connection pool update.

bump version

resolved issue with configure method

added performance improvements to cache_store_redis by implementing c…

…onneciton pooling and atomic pipeline for set/expire commands

resolved backwards compatability issue and added support for jruby