Disable the mode if no checker is available
Fix root directory detection

Do not falsely consider paths ending with a slash as root directories.
Fix conditional in `flycheck-find-file-in-tree`

The last branch needs a CONDITION.
Fix docstring
Fix `eval` cells in checker cell commands

Refactor the shell command creation to correctly substitute all special
argument cells, and quote their return values correctly.
Fix $HOME fallback when searching for files
Add tests for the checker API

Especially test the argument substitution and configuration file search.
Add test for `flycheck-find-file-in-tree`
Update tests for latest jshint release

Fix expected message, and remove broken test
Verify expected result types of `eval` cell

Also document the expected result types.
Add support for config files specified as single arguments

This change prepares for [#72] and the subsequent support for coding
standards in the PHP CodeSniffer checker, which does only accept options
and values given as single argument.
Re-build the manual with Texinfo 5
Release 0.7.1

Includes a lot of fixes to argument substitution and configuration file
lookup.
Fix no query flag
Remove superfluous code

There is no need for point excursion in `flycheck-add-overlay` anymore,
because `flycheck-error-region` already gives us a proper error region.
Always update Python packages when provisioning
Update and fix Flycheck for flake8 2.0
Add support for McCabe warnings in Flake8 2
Specify file coding systems