prepare v0.6.0
prepare dist package
change default log config
include all sub modules
sina weibo now supports image attachments
support package level static data
fix typo
Detect and change storage dir intelligently:

   * If CWD has "conf" and "save", use CWD.
   * Else, use "~/.snsapi"
more of v0.6.0
fix typo: classifier
fix the method routing logic of SNSPocket:

   * Previously, if 'channel' arg is given and it is expired,
   pocket will operate on all other channels.
   * Besides, the existence of 'channel' in pocket is not checked.
v0.6.1 improve packaging
Change 'provides' to a list.

   * a single str is OK according to the doc.
   * However, the PyPI website does not render it correctly.
   https://pypi.python.org/pypi/snsapi/0.6.1/
address Issue #86 with setuptools
v0.6.2
put the doc of attachment to mandatory and re-typeset it
solve merge conflict in snspocket
change short URL UT.

   * Google is not a good source for this test.
   It will redirect to local URLs.
Merge branch 'master' into dev
digest(): use GMT instead of local time