Class for search a web-shells. 
Work principle - search of coincidence. In a base file words lie,
which meet in a web-shells. The class touches all files on your 
web resource also searches there for coincidence to base
Variables:
	- $base_file - a base file. The necessary format: txt
 	- $alternative_base - words for search. The necessary format: word1, word2
 	If this variable is defined, search will be carried out 
	 Only by these words(word)
 	- $extension - expansion of files in which it is necessary to search
 	- $scan_dir - directory for check
 	- $chmod - if this variable is defined, search will be is made only
 	In those directories, if chmod 777
	
Example of start without parameters:
	$check=new WSSClass_c();
	print_r($check->check_dirs());
	
	At such start - the current directory will be scanned
	
	
Scanning of the previous directory
- Only files with expansion php
- Words for search - system, cmd
- To search only in directories with chmod 777
	$check=new WSSClass_c();
	$check->alternative_base("system,cmd");
	$check->extension="php";
	$check->scan_dir="..";
	$check->chmod=true;
	
	print_r($check->check_dirs());	 
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