The exception raised when trying to use Mod on complex numbers is now raised in more such situations

Behavior of integer division can now be controlled with config.int_division, and the default value does not break code anymore

Added a simple test to test that Theano crashes when trying to do x % y with either x or y a complex number

Removed testing of Mod op on complex numbers (deprecated -- and maybe not working properly -- in numpy currently), to avoid a warning in tests

Avoid duplicating existing lists of numeric types when checking for types of arguments in a Mod operation

Fixed potential bug with default dtypes, and added ability to control nstreams in other sampling methods than just uniform

Removed shared / shared_constructor / pfunc from compile.sandbox, please use theano.shared / theano.function instead

Added option config.on_opt_error to decide between a warning vs an exception when a crash occurs in an optimization

infer_shape does not survive through all exceptions anymore, and now uses ShapeError instead of NotImplementedError to catch situations where a shape cannot be computed

Using a custom exception for integer divisions (safer), and fixed crash due to this newly raised exception

Additional changes:
    - Implemented floor div (//) for the Scalar type
    - Trying to use a true div (/) on integer arguments will raise an
      exception
    - True div on unsigned integers is now coherent with the behavior on
      signed integers
    - True div on integers now results in floatX instead of systematically being
      float64
    - Added a few sanity checks in TrueDiv.grad
    - An exception is raised if one tries to use a constant of type 'long',
      because it is not clear what is going to happen
    - Fixed mean() of unsigned integer arrays