Simplify build process
-mfpmath causes cmake error when using clang.
Make -stdlib=libc++ clang-only.
Merge pull request #80 from forcedotcom/clang-flag-fix

-mfpmath causes cmake error when using clang.
Sketch a python|debug|release build split
Force cmake builds, deprecate PYDISTRIBUTIONS_USE_LIB
Remember to install libraries in install_cc make target
Don't link distributions against itself.

DISTRIBUTIONS_SHARED_LIBS was used for two things: the libraries to link
to libdistributions, and the libraries to link to programs using
libdistributions. Now it is only the libraries to link to
libdistributions; programs using libdistributions link to
libdistributions and get its dependencies automatically.
Make example build with clang.
Set library path before running examples.
Merge pull request #81 from forcedotcom/fix-recursive-link

Don't link distributions against itself.
Merge pull request #82 from forcedotcom/fix-examples

Fix examples
Merge pull request #79 from forcedotcom/simplify-build

Simplify build process