Dotdrop

* recursively check for template when installing (58)
* add ability to pass arguments to action (59 and [action doc](https://github.com/deadc0de6/dotdrop#use-actions))
* `pre` action are now only executed if the dotfile is installed
* add more tests
* fix some bugs and improve doc

- add ability to ignore patterns per dotfile in the config file (see [cmpignore](https://github.com/deadc0de6/dotdrop#config))
- ignore patterns follow Unix shell-style wildcards (see [compare](https://github.com/deadc0de6/dotdrop#compare-dotfiles))

* fix setup.py

* default profile can be defined using environment variable (`DOTDROP_PROFILE`) - [doc](https://github.com/deadc0de6/dotdrop#list-profiles)
* ability to symlink dotfiles generated by a template to a working directory (`~/.config/dotdrop`) - [doc](https://github.com/deadc0de6/dotdrop#symlink-dotfiles)
* add ability to generate dotfiles to a temporary directory for review and manual comparison (`install -t`) - [doc](https://github.com/deadc0de6/dotdrop#debug-template)
* allow to add globally available template variables in the config file (new entry `variables`) - [doc](https://github.com/deadc0de6/dotdrop#available-variables)
* provide a function to add a generated header in templates (`{{ header() }}`) - [doc](https://github.com/deadc0de6/dotdrop#dotdrop-header)
* portable way of getting hostname
* update README
* fix some minor bugs and improve code

* fix expand tild in update

* fix multiple bugs in `update`, thanks to maxchaos
* add more tests