More important View Changes

1. Moved the Activites to the new package de.hfu.meetme.views
2. Made Settings Save Button wider.
3. Clicking the Settings save button will now make an intent to the
mainAcitivity
4. A MMUser is now saved as static attribute in the mainActivity after
clicking the save button.

Caution: The current method to create the MMUser expects the input to be
correct.