renamed abstract stream classes
IStreamBuffer.rewind() rewinds to beginning of buffer by default
comment tweak for stream.py
improved tests for IStreamZlib
Python 2.6 fix for IStreamZlibTest
tutorial.md fixes and tweaks
minor tweaks to reader.py and writer.py
delim argument to DelimitedWriter() no longer has a default value
minor tweaks to dtype.py
consolidated filter() tests
refactored test_reader.py
cleaned up code for test_dtype.py
refactored ArrayType tests
fixed default format strings for DatetimeType and ArrayType
ArrayType now fully supports default values
removed fields() method from _TabularReader/Writer
code and doc cleanup for ArrayType
v0.1.2