Added TweetHashTag and TweetHashTagDB for tweetHashTag table

Merge origin/master

Changelog:

Added HashTag.java

Fixed the extra "Follow" button bug. Now each suggested user only has

Fixed a few bugs that caused the application to not allow new users to

User.java:

modified code to color hashtags, in addition to user mentions.

added salt and hash password for update in membershipServlet.

Added salted and hashed password functionality. Various files were

home.jsp:

User.java:

Changed the coloring of mentions from HTML style to CSS as per the requirement.

Tweet.java:

home.jsp: added a statement for c:out tweet_info.message to allow for