Add install script to symlink pear to usr/local/bin

So, interesting problem here. 

If I symlink the git-pear folder to `bin`, I can't use it anywhere. Except for inside `bin`. And only as `git-pear/pear`. So, that's weird.

If I symlink `pear`, I get the following
![symlink](https://cloud.githubusercontent.com/assets/3118416/3544713/d98b05ba-086f-11e4-9739-fe49c0a8be92.png)

Couple questions:
* How can we bring the whole folder into `bin`, and yet still be able to call `pear`?  Do we have to copy the `pear` executable and the rest of the directory *separately* into `bin`?
* Why symlink and not a hard link? If they delete the `git-pear` folder after they run `pear install`, won't the symlink be dead?