Pull request - history service additions to engine and engine-rest projects

Please accept the following history service additions to the engine and engine-rest projects, only these commits:

Jul 22, 2013
Commit	feat(rest/engine) Added historic process instance, activity and varia… …	ff9829c

Jul 24, 2013
Commit	fix(engine) historic process instance deleted flag and additional tests	d313304

Jul 25, 2013
Commit	feat(rest) Added history rest service	9b71802
Commit	fix(rest) added additional wink tests	ccf4975
Commit	fix(rest) Added History service into the process engine service	66e8b62

Jul 29, 2013
Commit	fix(rest) added additional history service tests	26d6f68