Remove stray text
Fix markup in README
[Fix #331] Add logo for Flycheck
Credit Matthias Güdemann for his help on the logo [#331]

Many, many thanks @mgudemann
Clarify licensing note in README
Drop the "flymake done right" tagline
Fix logo URL in README

We still had the wrong branch name inside
Fix the logo border

[ci skip]
Move contributor docs into subdir
Document how to rebuild the rasterized logo images
Document rebuilding the Texinfo manual
Document how to build the documentation

META
Improve the toctree of the contributor guide
[Fix #405] Support ruby-lint 2.0

Starting with version 2.0 of ruby-lint the "analyze" sub command no
longer exists.
Rebuild the Texinfo manual
Update my email address
rust: Make --test flag to rustc configurable

The `--test` flag is usually desirable for checking Rust code, but in
certain cases (like when `#![no_std]` is used in the current file) it
causes unexpected and difficult-to-trace errors in the checker.
Merge pull request #406 from tomjakubowski/rust-test-configure

rust: Make --test flag to rustc configurable
Update credits and changelog [#406]

Awesome work by @tomjakubowski.  Many, many thanks!
Add an option to enable inconclusive cppcheck checks.

This allows Cppcheck to report warnings it's not certain of, but it
may result in false positives.