Fixed a segfault when reopening files with object types
The object arrays can be passed in the carray constructor now.
Merge branch 'master' into vlen
Full range of string bit types.
Added a new testunit file for testing the new blob data type.
Added persistent tests for blob datatype.
Fixes.
Merge branch 'vlen2_fix' into vlen2
Hack to partially fix Francesc bug.
Removed the duplicity in string registry
Fixed the remaning problems exposed by test_vlen.py tests
Added support for opening vlen data from disk
Added an Array.append() and Array.commit() methods for carray backend
Testing for pure unicode strings as objects (returned as 0-dim arrays)
Adding a small benchmark comparison against PyTables for vlen objects
Merge branch 'vlen2'

Conflicts:
	blaze/carray/carrayExtension.pyx
	blaze/carray/utils.py
	blaze/datashape/coretypes.py