Using bundler pre again

Looks like the newly released bundler 1.3 didn't make it to travis yet because the builds continue to fail. Let's use this again in the meantime.
fix russian february typo #1087
use memcached gem

memcache-client is already deprecated
https://github.com/mperham/memcache-client#memcache-client-is-deprecated-as-of-august-2010--it-will-be-supported-through-2010-but-new-code-should-use-dalli-instead
if can not connect memcached, skip memcache with memcached server tests
if can not connect redis, skip redis with redis server tests
divide skip cause for Mongo test

- cause 1 : Mongo lib LoadError
- cause 2 : can not connect to Mongo server
skip redis test of redis not available
Merge branch 'bash0C7-skip-padrino-cache-test-if-can-not-connect-to-cache-server'

Conflicts:
	padrino-cache/test/test_stores.rb
update CHANGES