Added response cache implementation facilities
Merge branch 'master' of https://github.com/etr/libhttpserver
Created a small testing library
Shortened code. Added functionalities
Added statistics to test
Used strategy pattern also for header setting and response enqueuing
Finalized work on caching system
Merge branch 'master' of https://github.com/etr/libhttpserver into test
Added autotest functionality and statistics
Removed unuseful comments
Moved all classes and functions into littletest namespace
Moved to version 0.6.0
Created operator= in webserver
Changed cache interface in order to simplify management
Solved concurrency problems with cache
Solved a bug that implied cache impossibility to update
Solved a bug in is_valid method
Moved to version 0.6.1
Solved a problem in closure actions
Added automatic test environment
Created methods to get statistics