Create /usr/local/bin (#35)

Create /usr/local/bin prior to running the copy command. If `bin`
does not exist, you are actually moving `bclm` to `/usr/local/` and
renaming `bclm` to `bin`. -a mistake I just made :)

Closes #34

README.md

@@ -31,6 +31,7 @@ $ sudo make install
 
 ```
 $ unzip bclm.zip
+$ sudo mkdir -p /usr/local/bin
 $ sudo cp bclm /usr/local/bin
 ```