Database and month top apps/games

Added database feature

• Games and apps searches are now store in database if it's new entry
• Increases search count if already in database/different month

Monthly top searches

• python post_monthly.py to post to subreddit with top number of searches per month.
• Hardcoded to /r/AndroidGaming for now.
• Change config.py to change number of top games/apps per month to post.

Database creation

• Use python create_table.py to create initial database schema.
• Change database file name in config.py.