Friendlier errors from build.rs and support for Windows stylus build #295
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cargo build --features=regenerate-css
should now have nicer errors and work on windowsIt is written mostly to solve: https://github.com/azerupi/mdBook/issues/293
but also fixes: https://github.com/azerupi/mdBook/issues/294
Please note that I have very little Rust experience so I would be very glad for critical review.
Build.rs has become quite wordy and error-chain was added as build-dependency which is quite hevyweight for what the script does.