Merge phpdbg into PHP-5.6

Conflicts:
	sapi/phpdbg/phpdbg.c
	sapi/phpdbg/phpdbg_prompt.c

diff --cc sapi/phpdbg/phpdbg.c
Simple merge

diff --cc sapi/phpdbg/phpdbg.h
Simple merge

diff --cc sapi/phpdbg/phpdbg_prompt.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_sigio_win32.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_sigio_win32.h
Simple merge