Add additional configuration tests to help in compilation

These tests should help produce more specific errors when the user is
missing one or more dependencies, instead of always failing on the
boost_thread test.
Fix linkage with pthread
Update copyright years
Bump version to 1.2.0

Ember 1.2.x will continue to use the legacy Cantera Python
interface. Ember >= 1.3 will use the new Cantera Python interface.
Bump version to 1.3.dev
Modify boundary grid point addition strategy

Increase grid spacing between successive grid points when adding grid
points at the left or right boundary.
Use new Cantera Python interface
Allow relative library and include directory paths
Add env_vars option to SCons
Use platform-specific library path environment variables
Move cythonize and extension module compilation to SCons
Fix gtest when <tr1/tuple> is not present