Doesn't check for source and build dependencies

[MagnetoOptical]

Running with:
./build.sh -a x86_64 -c 8 --cern-branch

In the process of running this I noted that it did not check for bzr, cmake, GLEW, Cairo, and SWIG. There may be other dependencies as well (like bzrtools).
For me, this was generally as simple as "brew install bzr" and "brew install cmake", etc. Continuing compiling now. bzrtools is mentioned in a previous Issue by another poster.

The script also assumes the user has registered with launchpad before. I don't think there is a way around this so perhaps it should be mentioned in the README that a quick bzr whoami "First Last [email protected]" needs to be done before starting in addition to the registration process...that would bypass the need to check for bar (but not bzrtools).

Otherwise, this is brilliant! (I'm assuming, of course, everything will work when it's done. ;)

I'm coming to OS X from Linux so I guess I'm quite a bit less perturbed than others. Just another day in the Matrix. Let me know if more information is needed.