Install prerequisite python package, tweepy.

Thic commit refs #94.
Add the python script to tweet.

This commit refs #94.
Deploy the tweet python script to /usr/local/bin.

This commit fixes #94.
Merge branch 'id/94' into dev
Change the condition for installing tweepy package.

Change the condition, because the absolute path/to/tweepy may change.
Avoid the failure to install the package, by using find command.

This commit fixes #94.
Merge branch 'id/94' into dev
Merge commit 'b07a9c966d130a7b155cd721ff1ebe7e6b6efbd4' into HEAD