Small improvements on due dates + key:value

ADD: syntax highlight for couples key:value
ADD: Handle DUE:date
CHG: No space between due: and date
CHG: Doc updated

README.markdown

@@ -2,9 +2,12 @@
 
 ## What is this plugin ?
 
-This plugin is a fork of freitass todo.txt (see section 1.3) vim plugin adding
-a nice two level sorting function designed for todo.txt files and a complete
-function for context and projects (see section 1.4).
+This plugin is a fork of [freitass
+todo.txt](https://github.com/freitass/todo.txt-vim). It add severals functionalities including a [hierarchical sort](#sort), a
+[complete](#complete) function, some stuff to handle [due dates](#due_dates)
+and others stuff see [new features](#new_features).
+
+Freitass announced on october 30th 2014 that he is not going to merge his version.
 
 ## Install
 
@@ -14,13 +17,16 @@ function for context and projects (see section 1.4).
     cd todo.txt-vim
     cp -r ./* ~/.vim
 
+
+If you want the help installed, run `:helptags ~/.vim/doc` inside vim after
+having copied the files.  Then you will be able to get the commands help with:
+`:h todo.txt`
+
 ### Pathogen install
 
     git clone https://github.com/dbeniamine/todo.txt-vim.git ~/.vim/bundle/todo.txt-vim
 
-If you want the help installed, run ":helptags ~/.vim/doc" inside vim after having copied the files.
-Then you will be able to get the commands help with: :h todo.txt
-
+Then from vim: `:Helptags` to update the doc
 
 ## Features included in Freitass version
 
@@ -32,8 +38,6 @@ This plugin gives syntax highlighting to [todo.txt](http://todotxt.com/) files.
 
 `<LocalLeader>s@` : Sort the file on @Contexts
 
-`<leader>-sd` : Sort the file by due-date
-
 `<LocalLeader>j` : Lower the priority of the current line
 
 `<LocalLeader>k` : Increase the priority of the current line
@@ -48,8 +52,6 @@ This plugin gives syntax highlighting to [todo.txt](http://todotxt.com/) files.
 
 `date<tab>`  : (Insert mode) Insert the current date
 
-`due:`  : (Insert mode) Insert 'due:' followed by the current date
-
 `<LocalLeader>x` : Toggle mark task as done (inserts current date as completion date)
 
 `<LocalLeader>X` : Mark all tasks as completed
@@ -58,6 +60,8 @@ This plugin gives syntax highlighting to [todo.txt](http://todotxt.com/) files.
 
 ## New features
 
+### Sort
+
 This fork provides a hierarchical sorting function designed to do by project
 and/or by context sorts and a priority sort.
 
@@ -72,7 +76,7 @@ see :help sort
     let g:Todo_txt_first_level_sort_mode="! i"
     let g:Todo_txt_second_level_sort_mode="i"
 
-Also `<LocalLeader>x` is a toggle which allow you to unmark a task as done.
+### Completion
 
 We also provide a nice complete function for project and context, to use it
 add the following lines to your vimrc:
@@ -97,3 +101,27 @@ buffers and for each of them, it will show their context and the name of the
 buffers in which they appears in the preview window.
 TodoCompelte does the same thing for context except that it gives in the
 preview the list of projects existing in each existing contexts.
+
+### Due dates
+
+I've integrated the [work from
+durcheinandr](https://github.com/durcheinandr/todo.txt-vim/) concerning due
+dates + some little improvements:
+
+Accorrding to the todo.txt rules, one can define due dates using `due:date` or
+`DUE:date` or any other  `key:value` combination. This plugins handle dates at
+the format `YYYY-MM-DD` and the key `due` can be spell using any combination
+of lower and upper case letters. The following mappings are provided:
+
+`<leader>-sd` : Sort the file by due-date. Entries with a due date appears
+sorted by at the beginning of the file, the rest of the file is not modified.
+
+`due:`  : (Insert mode) Insert `due:` followed by the current date
+
+`DUE:`  : (Insert mode) Insert `DUE:` followed by the current date
+
+### Others
+
+`<LocalLeader>x` is a toggle which allow you to unmark a task as done.
+
+Syntax highlighting for couples key:value