Replace a simple "num_args" argument with a packed struct that takes
num_args and adds num_keywords, has_varargs, and has_kwargs.  Tried
to add asserts in all the places that don't allow
keywords/varargs/starargs

Started refactoring things; got to the point of attempting
argument->parameter shuffling, but it's tricky if we allow every
compilation to have a different signature (used by builtins).
Really they all have the same signatures but different
specializations; to get to that point, need to add defaults.

- Support parsing (but not running) **kw in function definitions
- more consistent assertion of what parts handle non-simple arguments or not

Added implementation of 'dir'

Implementation of __iter__ for tuple, added tests

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

- Added dir0 which would in theory return the local scope, but
  for just returns the content of the builtins module
- Added a unit test file for dir which won't print anything as the
  list sorting does not work as expected at the moment
  (missing full implementation) and the attributes are different
  as well (pyston has some CPython 2.7.5 does not have and vice versa)
- dir1 implements the lookup on a passed object
  - If the object has a __dir__ method, it will call it and return the result
    returned by this method
  - Otherwise all class and instance attributes and methods are returned
  - If the object has a __dict__ attribute, additional to the previous one
    it will return the keys from that one as well
Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

For the release build, was building both tools/ and tools/llc (and tools/opt),
which could potentially run at the same time and interfere with each other.

These seem to work fairly well as tests since
- they don't use any external libraries, and
- they have a very straightforward input-to-output model

Added some more runtime functions
gcj_2014_2d is currently crashing pyston

The presence of an allocated "elts" pointer is determined by capacity>0,
but the GC handler was incorrectly only choosing to visit it if size>0.
Not all code paths free the elts array if size goes down to zero, so
it could happen that capacity>0 and size=0, and then the elts array would
not be tracked even though it was expected to be.

Added a test that illustrates this.

Implement str.lstrip and str.rstrip

Added hasattr implementation buildin

Implement dict iterators

Removed assert from str to make __iter__ work again

fix lint.py

Compiling fixes

Unlike some other languages, it looks like eval()
doesn't force the capturing of outer variables.

Good thing too, since pretty much any function call
could theoretically end up resolving to eval().