DESIGN.md: Add markdown headings

DESIGN.md

@@ -1,4 +1,3 @@
-
 For notes about internationalization, see README-NLS.
 
 EncFS is a program which provides an encrypted virtual filesystem for Linux
@@ -7,7 +6,8 @@ download the latest version of FUSE ).  FUSE provides a loadable kernel module
 which exports a filesystem interface to user-mode.  EncFS runs entirely in
 user-mode and acts as a transparent encrypted filesystem.
 
-Usage:
+Usage
+-----
 
  - To see command line options, see the man page for encfs and encfsctl, or for
    brief usage message, run the programs without an argument (or '-h'):
@@ -33,7 +33,8 @@ Usage:
    created.
 
 
-Technology:
+Technology
+----------
 
  - Encfs uses algorithms from third-party libraries (OpenSSL is the default) to
    encrypt data and filenames.
@@ -92,7 +93,8 @@ Technology:
    file has a unique initialization vector.  This makes it infeasible to copy a
    whole block from one file to another. 
 
-Backward Compatibility:
+Backward Compatibility
+----------------------
 
    At the top level of the raw (encrypted) storage for an EncFS filesystem is a
    configuration file, created automatically by EncFS when a new filesystem is
@@ -109,15 +111,17 @@ Backward Compatibility:
    newer versions use algorithms and/or new options which were not previously
    available.
 
-Utility:
+Utility
+-------
 
    In addition to the "encfs" main program, a utility "encfsctl" has been
    provided which can perform some operations on encfs filesystems.  Encfsctl
    can display information about the filesystem for the curious (the encryption
    algorithm used, key length, block size), and more importantly it can also
    change the user-supplied password used to encrypt the volume key.
 
-Dependencies:
+Dependencies
+------------
 
    Encfs uses the OpenSSL toolkit (http://www.openssl.org) by default.
    OpenSSL is not covered by the GPL, and some people are concerned about the