[odb_backend] don't support stream at this time

Author: chobie

README.md

@@ -2,6 +2,9 @@
 
 php-git2 is a PHP bindings to the libgit2 linkable C Git library. 
 
+* API Documentation: http://libgit2.github.com/libgit2/#v0.20.0 (also see Signature conversions section)
+* IRC: #php-git on irc.freenode.net.
+
 ## Status
 
 0.3.0 Alpha (switching to functions)
@@ -55,8 +58,6 @@ resource|bool function git_repository_init(string $path, long $is_bare);
 public struct (e.g: git_config_entry) should consider return as an array.
 ````
 
-see libgit2.github.com/libgit2/#v0.20.0
-
 ##### file name rules.
 
 basically, we rely libgit2 grouping at this time. (`branch` group functions should be in branch.c)

odb.c

@@ -1063,7 +1063,7 @@ PHP_FUNCTION(git_odb_backend_new)
 	backend->parent.write = &php_git2_odb_backend_write;
 	backend->parent.read_prefix = &php_git2_odb_backend_read_prefix;
 	backend->parent.read_header = &php_git2_odb_backend_read_header;
-	backend->parent.writestream = &php_git2_odb_backend_writestream;
+	//backend->parent.writestream = &php_git2_odb_backend_writestream;
 	backend->parent.exists = &php_git2_odb_backend_exists;
 	backend->parent.foreach = &php_git2_odb_backend_foreach;
 	backend->parent.free = &php_git2_odb_backend_free;