[Home Page] Alerts for moderated communities

[murfguy]

On the home page, show alerts for the following events:

• Unfulfilled pending member requests
• number of new memberships since last login

[murfguy]

Home Page now displays number of pending members for communities a user manages.

Issue deemed completed as of v0.2.6. As "number of new members" may or not be implemented to new home page setup.