Merge pull request #21 from oker1/brew_prefix

Fix hardcoded /usr/local/bin in boostfb formula
working again, need review
Correct install order of MySQL deps
Merge pull request #29 from ardecvz/mysql-patch

Correct install order of MySQL deps
Introduce CAVEATS section for tricky install situations
Merge pull request #30 from ardecvz/caveats

Introduce CAVEATS section for tricky install situations
dont add brew prefix to library/include path, since wrong libevent headers are found by gcc
fix mysql and freetype include dirs