[AESH-240] mkdir command and little fix on ls command because was breaking checkstyle (unused import).
license
FileDisplayer - pgup/pgdown jumped on wrong line

1. pgup - jumped 2 lines below the correct line (incorrect +-1)

2. pgup/pdgown with combination of number should jump to
     (rows - 1) * number

     but was

     rows * number - 1
Merge pull request #15 from rbalent/file-displayer-pgup-pgdown

FileDisplayer - pgup/pgdown jumped on wrong line
Merge pull request #14 from eprogramming/AESH-240

[Aesh-240]
mkdir now with -p option
Mkdir unit test.
Arguments type are now File, more cleanup, test of parents too.
removing thread.sleep 'debug mode'
removing InterruptedException from after test method.
Merge pull request #16 from eprogramming/contrib

mkdir now with -p option
Bug fix AESH-252.
Merge pull request #17 from eprogramming/AESH-252

AESH-252.
[AESH-249]
updated to changes in æsh, completion does not work correctly
[AESH-249]
close stream
[AESH-249]
updated to work with latest api changes