added pure python memory profiling package
Prepend PKG_CONFIG_PATH in when_build_dependency.

This helps avoiding accidents where we accidentally use
a system package despite specifying a local package.
Add Piranha package
Add the CSymPy package
CSymPy: Use out of tree build

It used to be that the Python wrappers could only be installed using the in
tree build, but now it works out of tree as well, so we use it.
flex build depends on m4
Merge pull request #333 from jcftang/wip-update-ansible

Update ansible to 1.6.5 stable - tested on mavericks (osx)
Merge pull request #334 from jcftang/wip-flex-depends-m4

flex build depends on m4, on a clean system don't assume m4 is available, so have flex depend on the internal one that hashstack provides
Merge pull request #268 from hashdist/piranha

[WIP] Add Piranha package
Merge pull request #332 from certik/csympy

Add the CSymPy package
Merge remote-tracking branch 'origin/master' into add_memory_profiler
added psutil dependency
don't use psutil on Cygwin
Update to the latest version
Merge pull request #336 from hashdist/piranha

Update to the latest version
Merge pull request #234 from hashdist/add_memory_profiler

added pure python memory profiling package
Add primesieve (primesieve.org) library
Merge pull request #338 from hashdist/primesieve

Add primesieve (primesieve.org) library
changed  module swap to unload/load and changed xt-libsci to cray-libsci
Merge pull request #339 from hashdist/update_garnet_prologue

changed  module swap to unload/load and changed xt-libsci to cray-libsci