Added warned_unsaved constant
Some code rewritten in Java 8 style
Added close on exit
Merge branch 'task3' into task4
System property warn_unsaved is now set
Merge branch 'task4' into task5
Merge pull request #282 from volodden/first

Володин Денис, 396, 03-MultiFileMap
Checkstyle fix
Updated parsers.
Unused variable.
Implemented getFile() method
Fixed typos
Merge branch 'task3' into task4
Merge branch 'task4' into task5
Added implementation stub
Renamed util -> utility
Merge branch 'task3' into task4
Moved MultiFileHashMap tests to package task3
Merge branch 'task4' into task5
Fixed test & moved to right package