Bug#775449: Provide sha size param instead of using environmental variable

[jnqnfe <jnqnfe@gmail.com>]

Additional patch attached to update the manpages with regard to the new
param introduced in the previously supplied patch.

commit 30a65d578daecbc58fe8159572d7c0da9af2ecee
Author: jnqnfe <jnqnfe@gmail.com>
Date:   Fri Jan 16 04:49:43 2015 +0000

    Update manpage with new --sha-size parameter

diff --git a/debootstrap.8 b/debootstrap.8
index 2cf44ca..3aa446d 100644
--- a/debootstrap.8
+++ b/debootstrap.8
@@ -152,6 +152,9 @@ Use the client certificate stored in file (PEM)
 .IP
 .IP "\fB\-\-private\-key=FILE\fP"
 Read the private key from file
+.IP
+.IP "\fB\-\-sha\-size=SIZE\fP"
+Set the size variant of sha checksum to use in performing checksum verification. Defaults to 256.
 
 .SH EXAMPLES
 .