Make HyObject.replace more resilient

This makes it work on quoted objects
Add macroexpand to core/language.hy
Added a simple test for macroexpand
Added documentation for macroexpand
Added macroexpand-1
Fixed --name-- scope problem using ugly inspect code
meth wasn't accepting correctly its parameters
Now also accepts more than 1 statement in the code part of the macro
refactored to use only 1 codebase (no more route != route-with-macros)
Fixed docstring
Added meth tests by mocking a Flask app
Add py_compile.{MAGIC, wr_long} to hy._compat.

Closes #344.
Much better version of new error messages.

This version is much simpler.

At the point that the exception is raised, we don't have access to
the actual source, just the current expression. but as the
exception percolates up, we can intercept it, add the source and
the re-raise it.

Then at the final point, in the cmdline handler, we can choose to
let the entire traceback print, or just the simpler, direct error
message.

And even with the full traceback, the last bit is nicely formatted
just like the shorter, simpler message.

The error message is colored if clint is installed, but to avoid
yet another dependency, you get monochrome without clint.

I'm sure there is a better way to do the markup, the current method
is kludgy but works.

I wish there was more shared code between HyTypeError and LexException
but they are kind of different in some fundamental ways.

This doesn't work (yet) with runtime errors generated from Python,
like NameError, but I have a method that can catch NameError and turn it
into a more pleasing output.

Finally, there is no obvious way to raise HyTypeError from pure Hy code,
so methods in core/language.hy throw ugly TypeError/ValueError.
Errors into errors.py, added HyMacroExpansionError, fixed macro arg fail
More updates, including from Foxboron, for errors like (for)
Cleaning up some comments from berker
Changing --show_tracebacks to --show-tracebacks
Fixing tests for new 'for' syntax
add news for 0.9.12
Add Kevin Zita to NEWS for 0.9.12.
Change the signature of (for) and (with).

 (for) is restored to clojure-like flatness.
 (with) can be used without the nested list if you don't care about the
        name.

   Tests and examples updated.
Merge pull request #406 from paultag/paultag/bugfix/im-an-idiot

Paultag/bugfix/im an idiot