Use homebrew tap instead of install.sh

This requires that the repository be renamed to homebrew-encfsmacosxfuse or similar.
See https://github.com/mxcl/homebrew/wiki/brew-tap
Rely on homebrew osxfuse rather than manual installation
Update readme with brew tap instructions
Name the formula encfs instead of encfsmacosxfuse
OSX 10.9 Mavericks support for boost

This version is the one from https://gist.github.com/defunctzombie/7324625 that works.

Closes #7
Update README with new tap command for overriding the default encfs
Bump version patch number
merged changes for boost and applied my patches for OSX