Fixes #94 and #99: added settings icon and logic to App Bar

[oa2013]

Fixes #94 and #99 .

Changes proposed in this pull request:

• Changed Settings Fragment to Settings Activity
• Added Settings gear icon to the App Bar
• Added names of contributors to Settings Activity
• Made sticky note images and sticky note text bigger

[oa2013]

@dambadipudi requested changes implemented, please review when you can.