Add the capability to specify an alternate uboot location.
 If the u-boot-beaglebone-eabi port is installed, used this.
 Otherwise use the source and compile
fix typo
Move uboot_eabi_port_* functions t board/BeagleBone/setup.sh
Merge pull request #72 from bocal/fix_uboot_port_detection

 Add the capability to specify an alternate uboot location.