[olio] Initial commit of new Olio workload.
[olio] Swapped content
[olio] (new:minor) In NegativeExponential class, added a new constructor to accept an external random number generator, in order to help experiment reproducibility.
[olio] Second mega-commit (towards a stable version).
[olio] (change:major) Many bug-fixes and changes.
[olio] (change:minor) Added dependence by Apache http-components-client v. 4.2.5
[olio] (change:major) Moved some deprecated and unused files to RUBiS since they are used there.
[rubis] Need Apache http-components-client v. 4.2.5
[olio] (change:major) Moved ScaleFactors.java into rubis workload (since it is
          needed there)
[olio] (change:major) Removed used of ScaleFactors class.
[olio] (change:minor) OlioSocialEvent object directly store OlioTag objects
          instead of tag names.
[olio] (bug-fix:major) Forgot to initialize the configuration instance
[olio] (change:minor) Added Olio-related configuration parameters.
[olio] (change:minor) Revert configuration parameters to their default values.
[olio] (bug-fix:major) Forgot the initialize the OlioUtility instance.
[olio] (bug-fix:major) Forget the not operator when checking for HTTP response.
[olio] (bug-fix:major) Forgot to read 'olio.numPreload*' configuration parameters.
[olio] (change:minor) Replaced http-components-client v. 4.2.5 with v. 4.3.1.
[olio] (change:major) Polished JARs inclusion
[olio] (bug-fix:minor) Removed use of ScaleFactors class