Init for tumblr package
added new config entries
added a couple of style correction thanks to golint
converted a couple of structure declaration in pointers, fixed build errors with version 1.2.1
first version for posting images on tumblr, changed g_PostTweet in
gPostTweet for compliance with go code style
added log message and better tags handling
removed decoupling
more logging messages for debug
removed debug logs and addded caption
Merge pull request #1 from kurojishi/tumblr

yup