fix: unnecessary try-catch blocks removed.
fix: correct names of modules.
fix: some mistakes in Read/Write methods of class Message .
fix: incorrect input-filenames generation
fix: adjust business-logic of messages buffer in accordance with requirements
fix: mistake with unnamed boost::mutex::scoped_lock instance.
fix: remove extra-messages to stdout
fix: remove extra messages which were dumped to console
     correct names of input files in accordance with requirements
     output results to disk-file
fix: output in accordance with requirements
adding image of Fredy Merkury to 7 lection pptx
creating 7 lection home task
Merge pull request #177 from PeterMoroz/puzzles-3-review

Puzzles 3 review seems to be all most ok
(duration should be calculated for each buffer separately)
if ( ofs.is_open() ) ("not" not enough)
Merge pull request #150 from PeterMoroz/puzzles-4

Puzzles 4 from Peter Moroz solved
adding puzzles.doc for 7 week
Merge branch 'master' of github.com:sidorovis/cpp_craft_1013
Merge remote-tracking branch 'ups/master'