new formula: ODB C++ Object-Relational Mapping(ORM)

Now ODB compiler is built from source.

The remain problem is I must use this command to install the formula
brew install odb --env=std since I use homebrew gcc.

Can I avoid it?

@adamv @mikemcquaid @mistydemeo 
It's detecting the compiler incorrectly, but if you remove `args` here and add:

```ruby
    fails_with :clang
    fails_with :gcc_4_0
    fails_with :gcc
    fails_with :llvm
```

Before the dependencies, then it will work.