Merge pull request #9 from alexeykuzmin/master

Grunt 0.4 support
Improving documentation
Latest explainations
Last call before publishing
Extending support to node 0.10
Strict mode checking
Expanding ~
Merge pull request #11 from oncletom/fix-11

~ in privateKey does not work
Preparing 0.2.1
Updating README with 0.2.2 goals
Documenting module
Renaming function and deprecating it
Renaming to better reflect the business of the module
Renaming extension helper
Replacing `fs` by `grunt.file.read`
Moving config read to a helper and dedicated file
Temporarily expanding configuration file to grab the private key
Updated doc and refactored configuration expansion
Dynamic filename fix
Fixing codebase