customizable consumer keys. thanks rhysd!

https://github.com/rhysd/TweetVim/commit/0ba60a3de519f760b58c629133caf446fd654456#commitcomment-3051302
no confirm when favorite
no confirm when remove_favorite action
fixed unauthorized message of in_reply_to
fixed in_reply_to
show default time if failed to parse date
updated vital
rm old vital
display username
Merge branch 'display user name' into dev
adjusted message to head
added dev code
close unnecessary stream
switch to userstream buffer
refactored
cache userstream buffer
improved auto scroll
fixed change account
display home timeline when switch account
added g:tweetvim_updatetime