Some fixings that let scipy tests pass.

major bjit improvements

float.cpp: now that we have float.c use some of the functions directly

CPython has this check. I think Pyston missed it when switch to the
CPython way of handling some inheritance functionality.

References:
CPython code:
https://github.com/python/cpython/blob/2.7/Objects/typeobject.c#L4074
Pyston commit that switch to the CPython way of handling it:
https://github.com/dropbox/pyston/commit/251f417abd68c4b018217ae3b1901b3f1687384d#diff-a5cc3ff8c761716ba33b328ad1d042dfR1499

And also add an extension for test.

complexTruediv will pass subtype of float to complexDivFloat,
so loose the type check in complexDivFloat, use PyFloat_Check
instead check the type exactly.

For some struct member in Pyston itself, add `const` qualifier,
for exenstion, do not add `const` for compatibility reason.

Pyston's PyInt_AsLong implementation didn't check tp_as_number->nb_int,
use CPython implementation with some Pyston modifications to avoid
recursive call.

this also workarounds the problem we were having on ubuntu 16.04 where we have to use std::isinf instead of isinf()

also add a option to pass MAP_32BIT to mmap

also fix a build error when ICs are disabled

Temporarily disable the clang build on travis-CI

Somehow this PR is taking longer to build, I assume from somehow missing
the build cache.

Assuming that it's a caching issue, bump up the time to satisfy un-cached builds.
If build times continue to increase we will run into this problem again (can only
regenerate the cache with a successful build but a successful build needs the cache),
but this will let us defer it a bit longer :)  Travis-CI builds are max 120 minutes.

Fix std::move error on temporary object

since we were installing it from the LLVM APT repo, which they
took down since it was getting too expensive.  I guess we can
just run with the gcc build until that situation gets resolved.

exec, input: if globals has no __builtins__ add it as a dictwrapper

update list of failing cpython tests

Bump version numbers

Some packaging / distributing updates

before we added a it as a module which made code fail
which does something like __builtins__["unicode"]

Switch to CPython's descrobject.c

The behavior changed in CPython 2.7.4, and Travis-CI runs 2.7.3.

until I realize that it's because we were passing more tests than we expected.

Create a simple Dockerfile