updated links in documentation
Merge pull request #298 from tracelytics/documentation-changes

updated links in documentation
Assure to set keys before testing them
Updated debugger for Ruby 1.9
Improved and cleaned up dalli tests
Limit perftools to mri 2.x
Better incr/decr counter handling in tests
Assure key is set before testing
Merge pull request #52 from appneta/issue_52

memcached tests fail only on Travis randomly
Merge remote-tracking branch 'public/master' into issue_54