Implemented available() method for input streams
Provided ability to set columns/rows for windows pty window through java properties
Merge pull request #7 from pchel-/stream_available

Implemented available() method for input streams
Merge pull request #8 from pchel-/win_columns

Provided ability to set columns/rows for windows pty window through java properties
Pty4j updated.
unix: Synchronized opening pseudo terminal master/slave - otherwise 'ptsname()' could return same slave name for different masters (created from different threads)