Julia: remove the lib copy hacks

With libflags this is not needed anymore.
- Update to latest tip for all FEniCS packages.
- Fix issues for DOLFIN on Cygwin.
- Add SWIG to build dependencies for FFC.
Update ansible to v1.6.0
Merge pull request #263 from hashdist/johannr/fenics-updates

FEniCS updates
Correct boost to compile with clang 3.4.
Merge pull request #264 from jcftang/wip-ansible

Update ansible to v1.6.0
Change how DOLFIN dependencies are specified. Fixes problem with
build_with parameter.
Merge pull request #266 from hashdist/johannr/fix-dolfin-deps

Change how DOLFIN deps are specified
Use setuptools instead of CMake when installing Python files for
VTK (fixes issue #262).
Merge pull request #267 from hashdist/johannr/vtk-python-install

Use setuptools for installing VTK Python files
Merge pull request #265 from robertmaynard/update_boost_155_1

Correct boost to compile with clang 3.4.
Merge commit '2ed286f'
dftatom: install Python wrappers into $ARTIFACT

Instead of the Python package itself. Fixes #254
Use python_site_packages_rel

Instead of the full path. Now it is platform independent.
Merge pull request #269 from hashdist/dftatom

dftatom: install Python wrappers into $ARTIFACT
Add py.test package
Add the `py` dependency to `pytest`
Add libc++ package (libcxx)
Set proper compilers
Add paths to libsupc++

These paths are the first two paths from:

    $ echo | g++ -Wp,-v -x c++ - -fsyntax-only
    ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
    ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../x86_64-linux-gnu/include"
    #include "..." search starts here:
    #include <...> search starts here:
     /usr/include/c++/4.6
     /usr/include/c++/4.6/x86_64-linux-gnu/.
     /usr/include/c++/4.6/backward
     /usr/lib/gcc/x86_64-linux-gnu/4.6/include
     /usr/local/include
     /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed
     /usr/include/x86_64-linux-gnu
     /usr/include
    End of search list.

Unfortunately this is platform dependent, so we need to possibly let the user
set these paths in default.yaml.