performance data can now be saved

* using a vector of performance_attributes_t pointer
* mutex for vector changes
removed iostream and let spawned task sleep less (max 25ms)
added memory cleanup for performance_vector
Merge branch 'master' of git://github.com/hyrise/hyrise into mutex_list
more std smart pointer, less cleanup
vname() not used any more
removed debug output
updated gitignore
improved test operations

* some less includes
* replaced copy'n'paste comments
* removed empty destrucors
fixed inconsistent brace placement
tab to spaces
used more const refs on shared_ptr
moved registration of responseTask and updated comment
Merge branch 'master' of git://github.com/hyrise/hyrise into mutex_list
Merge branch 'mutex_list'