Adapters::LRUHash: add option :max_value
changes

[ci skip]
update readme

[ci skip]
add link to https://github.com/etolabo/kumofs

[ci skip]
Transformer: add hex encoder
fix #54, store blobs in sequel
sequel doesn't need base64 encode values
json serializer: don't wrap the object
changes

[ci skip]
add php serializer
update activesupport
Merge branch 'master' into staging

Conflicts:
	lib/moneta.rb