Merge branch 'release/0.3.1'

* release/0.3.1:
  added observe function
  bump version
  switch to EDN serialization by default also make CAS strategy smart about Time/DateTime conversions that may happen during serialization
  pass through client option
  don't require memcache lib for all k/v stores
  version 0.2.2
  don't require files moved into other gem
  added 'dalli' backend - newer memcache lib
  version 0.2.1
  use JSON class additions
  add test tasks to rakefile
Merge tag 'RELEASE_0.3.1' into develop

0.3.1 - dalli and observe mode added

* tag 'RELEASE_0.3.1':