Unit tests for blaze.metadata package
Add blaze.test_utils.temp_dir(), a context manager that creates a
temporary directory and cleans it up when exiting the block.

Handy for writing unit tests that need to create files on disk. To
debug tests, set environment variable BLAZE_TEST_KEEP_TEMP to 1 and
the temporary directory paths will be printed to stderr and not be
deleted.
Unit tests for blaze.toplevel.open().  Don't pass yet.
Cleanup of blaze.toplevel.open().

Require a URI (rather than allowing uri=None implicitly).  Also fix
URI parsing to allow URI to specify on-disk relative and absolute
paths like:

  sqlite://foo.sqlite
  ctable:///tmp/mytable
  carray:///home/user/array
Give Table a datashape property to match Array and NDTable.
Merge pull request #35 from seibert/test_coverage

More unit tests
Seperate concerns on module.
Remove vestigal compiler cruft and vestigal tests.
Remove old notes and vestigal unify module.
CDatashape moved into BLIR prelude.
Fix several broken tests suites.
Added Stan to authors list.
Notes about Acaconda CE -> Anaconda
Added Blir + LLVM Backend
Update the docs with compiler infastructure.
Remove old pipeline.
Standalone BLIR
Remove old compile folder in favor or pure BLIR
Migrate RTS tests over to /blaze/tests
Added pycparser dep, per Ilan's merge to Anaconda