Implemented issue #304: File name and line number info for overloaded var_dump().
Merged pull request #97
Implemented issue #310: Allow class vars and array keys with xdebug_debug_zval().

This also introduces test files for xdebug_debug_zval() and
xdebug_debug_zval_stdout().
Merged pull request #98
Merge branch 'master' of github.com:xdebug/xdebug