fix doc build, add more doc
add Blogger page support. close #1
add Blogger post draft support. close #2

#15 is created for page kind, which does include status for draft status in response body, but changing is not impossible at this moment. page kind doesn't have publish or revert methods or isDraft with insert method.
finalize v0.7.0
Added tag v0.7.0 for changeset fd11a2ddef0d
fix doc version string
Make it possible to run tests w/o Blogger support.