Update documentation

Documentation/ReleaseNotes.txt

@@ -1,5 +1,13 @@
 GitX Release Notes
 
+V0.3: Changes since v0.2.1
+====
+* You can now pass on command-line arguments just like you can with 'git log'
+* The program has an icon
+* Also displays remote branches in the branch list
+* Is better in determining if a directory is a bare git repository
+
+
 V0.2.1
 ===
 * Added Sparkle update system

README

@@ -20,7 +20,7 @@ hopefully more features will be added. Currently GitX supports the following:
   * Look at the complete tree of any revision
     * Preview any file in the tree in a text view or with QuickLook
     * Drag and drop files out of the tree view to copy them to your system
-  
+   * Support for all parameters git rev-list has
 # License
 
 GitX is licensed under the GPL version 2. For more information, see the attached COPYING file.
@@ -45,6 +45,16 @@ collection), you will not be able to compile it on previous versions of OS X.
 
 To compile GitX, open the GitX.xcodeproj file and hit "Build".
 
+# Usage
+
+GitX itself is fairly simple. Most of its power is in the 'gitx' binary, which
+you should install through the menu. the 'gitx' binary supports most of git
+rev-list's arguments. For example, you can run `gitx --all' to display all
+branches in the repository, or `gitx -- Documentation' to only show commits
+relating to the 'Documentation' subdirectory. With `gitx -Shaha', gitx will
+only show commits that contain the word 'haha'. Similarly, with 'gitx
+v0.2.1..', you will get a list of all commits since version 0.2.1.
+
 # Helping out
 
 Any help on GitX is welcome. GitX is programmed in Objective-C, but even if